diff --git a/src/main/java/cr0s/warpdrive/block/passive/BlockAir.java b/src/main/java/cr0s/warpdrive/block/passive/BlockAir.java
index 6922f93f..a48885e9 100644
--- a/src/main/java/cr0s/warpdrive/block/passive/BlockAir.java
+++ b/src/main/java/cr0s/warpdrive/block/passive/BlockAir.java
@@ -113,7 +113,7 @@ public class BlockAir extends Block
 	public int quantityDropped(Random par1Random) {
 		return 0;
 	}
-
+	
 	/**
 	 * How many world ticks before ticking
 	 */
@@ -121,7 +121,7 @@ public class BlockAir extends Block
 	public int tickRate(World par1World) {
 		return AIR_BLOCK_TICKS;
 	}
-
+	
 	/**
 	 * Ticks the block if it's been scheduled
 	 */
@@ -129,7 +129,7 @@ public class BlockAir extends Block
 	public void updateTick(World par1World, int x, int y, int z, Random par5Random) {
 		int concentration = par1World.getBlockMetadata(x, y, z);
 		boolean isInSpaceWorld = par1World.provider.dimensionId == WarpDriveConfig.G_SPACE_DIMENSION_ID || par1World.provider.dimensionId == WarpDriveConfig.G_HYPERSPACE_DIMENSION_ID;
-
+		
 		// Remove air block to vacuum block
 		if (concentration <= 0 || !isInSpaceWorld) {
 			par1World.setBlock(x, y, z, Blocks.air, 0, 3); // replace our air block to vacuum block
@@ -137,144 +137,204 @@ public class BlockAir extends Block
 			// Try to spread the air
 			spreadAirBlock(par1World, x, y, z, concentration);
 		}
-
-		par1World.scheduleBlockUpdate(x, y, z, this, AIR_BLOCK_TICKS);
+		par1World.scheduleBlockUpdate(x, y, z, this, 30 + 2 * concentration);
 	}
-
+	
 	@Override
 	public boolean shouldSideBeRendered(IBlockAccess world, int x, int y, int z, int side) {
 		if (AIR_DEBUG) {
-			return side == 0;
+			return side == 0 || side == 1;
 		}
-
+		
 		Block sideBlock = world.getBlock(x, y, z);
-		if (sideBlock.isAssociatedBlock(this)) { //TODO: Check if this works
+		if (sideBlock == this) {// TODO: Check if this works
 			return false;
 		}
 		return world.isAirBlock(x, y, z);
 	}
-
+	
 	private void spreadAirBlock(World world, int x, int y, int z, int concentration) {
 		int air_count = 1;
 		int empty_count = 0;
-		int sum_concentration = concentration;
-
-		// Count air in adjacent blocks
+		int sum_concentration = concentration + 1;
+		int max_concentration = concentration + 1;
+		int min_concentration = concentration + 1;
+		
+		// Check air in adjacent blocks
 		Block xp_block = world.getBlock(x + 1, y, z);
-		boolean xp_isAir = world.isAirBlock(x + 1, y, z);;
-		int xp_concentration = (xp_block != this) ? 0 : world.getBlockMetadata(x + 1, y, z);
+		boolean xp_isAir = world.isAirBlock(x + 1, y, z);
+		int xp_concentration = (xp_block != this) ? -1 : world.getBlockMetadata(x + 1, y, z);
 		if (xp_isAir) {
 			air_count++;
-			if (xp_concentration > 0) {
-				sum_concentration += xp_concentration;
+			if (xp_concentration >= 0) {
+				sum_concentration += xp_concentration + 1;
+				max_concentration = Math.max(max_concentration, xp_concentration + 1);
+				min_concentration = Math.min(min_concentration, xp_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
 		Block xn_block = world.getBlock(x - 1, y, z);
 		boolean xn_isAir = world.isAirBlock(x - 1, y, z);
-		int xn_concentration = (xn_block != this) ? 0 : world.getBlockMetadata(x - 1, y, z);
+		int xn_concentration = (xn_block != this) ? -1 : world.getBlockMetadata(x - 1, y, z);
 		if (xn_isAir) {
 			air_count++;
-			if (xn_concentration > 0) {
-				sum_concentration += xn_concentration;
+			if (xn_concentration >= 0) {
+				sum_concentration += xn_concentration + 1;
+				max_concentration = Math.max(max_concentration, xn_concentration + 1);
+				min_concentration = Math.min(min_concentration, xn_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
 		Block yp_block = world.getBlock(x, y + 1, z);
 		boolean yp_isAir = world.isAirBlock(x, y + 1, z);
-		int yp_concentration = (yp_block != this) ? 0 : world.getBlockMetadata(x, y + 1, z);
+		int yp_concentration = (yp_block != this) ? -1 : world.getBlockMetadata(x, y + 1, z);
 		if (yp_isAir) {
 			air_count++;
-			if (yp_concentration > 0) {
-				sum_concentration += yp_concentration;
+			if (yp_concentration >= 0) {
+				sum_concentration += yp_concentration + 1;
+				max_concentration = Math.max(max_concentration, yp_concentration + 1);
+				min_concentration = Math.min(min_concentration, yp_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
 		Block yn_block = world.getBlock(x, y - 1, z);
 		boolean yn_isAir = world.isAirBlock(x, y - 1, z);
-		int yn_concentration = (yn_block != this) ? 0 : world.getBlockMetadata(x, y - 1, z);
+		int yn_concentration = (yn_block != this) ? -1 : world.getBlockMetadata(x, y - 1, z);
 		if (yn_isAir) {
 			air_count++;
-			if (yn_concentration > 0) {
-				sum_concentration += yn_concentration;
+			if (yn_concentration >= 0) {
+				sum_concentration += yn_concentration + 1;
+				max_concentration = Math.max(max_concentration, yn_concentration + 1);
+				min_concentration = Math.min(min_concentration, yn_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
 		Block zp_block = world.getBlock(x, y, z + 1);
 		boolean zp_isAir = world.isAirBlock(x, y, z + 1);
-		int zp_concentration = (zp_block != this) ? 0 : world.getBlockMetadata(x, y, z + 1);
+		int zp_concentration = (zp_block != this) ? -1 : world.getBlockMetadata(x, y, z + 1);
 		if (zp_isAir) {
 			air_count++;
-			if (zp_concentration > 0) {
-				sum_concentration += zp_concentration;
+			if (zp_concentration >= 0) {
+				sum_concentration += zp_concentration + 1;
+				max_concentration = Math.max(max_concentration, zp_concentration + 1);
+				min_concentration = Math.min(min_concentration, zp_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
 		Block zn_block = world.getBlock(x, y, z - 1);
 		boolean zn_isAir = world.isAirBlock(x, y, z - 1);
-		int zn_concentration = (zn_block != this) ? 0 : world.getBlockMetadata(x, y, z - 1);
+		int zn_concentration = (zn_block != this) ? -1 : world.getBlockMetadata(x, y, z - 1);
 		if (zn_isAir) {
 			air_count++;
-			if (zn_concentration > 0) {
-				sum_concentration += zn_concentration;
+			if (zn_concentration >= 0) {
+				sum_concentration += zn_concentration + 1;
+				max_concentration = Math.max(max_concentration, zn_concentration + 1);
+				min_concentration = Math.min(min_concentration, zn_concentration + 1);
 			} else {
 				empty_count++;
 			}
 		}
-
+		
+		// air leaks means penalty plus some randomization for visual effects
 		if (empty_count > 0) {
 			if (concentration < 8) {
 				sum_concentration -= empty_count;
 			} else if (concentration < 4) {
 				sum_concentration -= empty_count + (world.rand.nextBoolean() ? 0 : empty_count);
 			} else {
-				sum_concentration -= 1;
+				sum_concentration -= air_count;
 			}
 		}
 		if (sum_concentration < 0) sum_concentration = 0;
-		int mid_concentration = (int) Math.floor(sum_concentration * 1.0F / air_count);
-		int new_concentration = sum_concentration - mid_concentration * (air_count - 1);
-		if (new_concentration > 14) {
-			new_concentration = 14;
+		
+		// compute new concentration, buffing closed space
+		int mid_concentration;
+		int new_concentration;
+		boolean isGrowth = false || (max_concentration > 8 && (max_concentration - min_concentration < 9)) || (max_concentration > 5 && (max_concentration - min_concentration < 4)); 
+		if (isGrowth) {
+			mid_concentration = Math.round(sum_concentration / (float)air_count) - 1;
+			new_concentration = sum_concentration - mid_concentration * (air_count - 1);
+			new_concentration = Math.max(Math.max(concentration + 1, max_concentration - 1), new_concentration - 20) - 0;
+		} else {
+			mid_concentration = 0;
+			new_concentration = 0;
+			mid_concentration = (int) Math.floor(sum_concentration / (float)air_count);
+			new_concentration = sum_concentration - mid_concentration * (air_count - 1);
+			if (empty_count > 0) {
+				new_concentration = Math.max(0, new_concentration - 5);
+			}
 		}
+		
+		// apply scale and clamp
+		if (mid_concentration < 1) {
+			mid_concentration = 0;
+		} else if (mid_concentration > 14) {
+			mid_concentration = 14;
+		} else if (mid_concentration > 0) {
+			mid_concentration--;
+		}
+		if (new_concentration < 1) {
+			new_concentration = 0;
+		} else if (new_concentration > max_concentration - 2) {
+			new_concentration = Math.max(0, max_concentration - 2);
+		} else {
+			new_concentration--;
+		}
+		
+		if (WarpDriveConfig.LOGGING_BREATHING && (new_concentration < 0 || mid_concentration < 0 || new_concentration > 14 || mid_concentration > 14)) {
+			WarpDrive.logger.info("Invalid concentration at step B " + isGrowth + " " + concentration + " + "
+					+ xp_concentration + " " + xn_concentration + " "
+					+ yp_concentration + " " + yn_concentration + " "
+					+ zp_concentration + " " + zn_concentration + " = " + sum_concentration + " total, " + empty_count + " empty / " + air_count
+					+ " -> " + new_concentration + " + " + (air_count - 1) + " * " + mid_concentration);
+		}
+		
+		// new_concentration = mid_concentration = 0;
+		
+		// protect air generator
 		if (concentration != new_concentration) {
 			if (concentration == 15) {
 				if ( xp_block != WarpDrive.blockAirGenerator && xn_block != WarpDrive.blockAirGenerator
 				  && yp_block != WarpDrive.blockAirGenerator && yn_block != WarpDrive.blockAirGenerator
 				  && zp_block != WarpDrive.blockAirGenerator && zn_block != WarpDrive.blockAirGenerator) {
-					//        			WarpDrive.debugPrint("AirGenerator not found, removing air block at " + x + ", " + y + ", " + z);
+					if (WarpDriveConfig.LOGGING_BREATHING) {
+						WarpDrive.logger.info("AirGenerator not found, removing air block at " + x + ", " + y + ", " + z);
+					}
 					world.setBlockMetadataWithNotify(x, y, z, 1, 2);
 				} else {
 					// keep the block as a source
-					/*	        		WarpDrive.debugPrint("15 + "
-        			  + xp_concentration + " " + xn_concentration + " "
-        			  + yp_concentration + " " + yn_concentration + " "
-        			  + zp_concentration + " " + zn_concentration + " = " + sum_concentration + " total, " + empty_count + " empty / " + air_count + " -> " + new_concentration);/**/
+					if (!WarpDriveConfig.LOGGING_BREATHING) {
+						WarpDrive.logger.info("15 + "
+								+ xp_concentration + " " + xn_concentration + " "
+								+ yp_concentration + " " + yn_concentration + " "
+								+ zp_concentration + " " + zn_concentration + " = " + sum_concentration + " total, " + empty_count + " empty / " + air_count + " -> " + new_concentration);/**/
+					}
 				}
 			} else {
 				world.setBlockMetadataWithNotify(x, y, z, new_concentration, 2);
 			}
 		}
-
+		
 		// Check and setup air to adjacent blocks
+		// (do not overwrite source block, do not decrease neighbors if we're growing)
 		if (xp_isAir) {
-			if (xp_block.isAssociatedBlock(this)) {
-				if (xp_concentration != mid_concentration && xp_concentration != 15) {
+			if (xp_block == this) {
+				if (xp_concentration != mid_concentration && xp_concentration != 15 && (!isGrowth || xp_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x + 1, y, z, mid_concentration, 2);
 				}
 			} else {
 				world.setBlock(x + 1, y, z, this, mid_concentration, 2);
 			}
 		}
-
+		
 		if (xn_isAir) {
-			if (xn_block.isAssociatedBlock(this)) {
-				if (xn_concentration != mid_concentration && xn_concentration != 15) {
+			if (xn_block == this) {
+				if (xn_concentration != mid_concentration && xn_concentration != 15 && (!isGrowth || xn_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x - 1, y, z, mid_concentration, 2);
 				}
 			} else {
@@ -283,8 +343,8 @@ public class BlockAir extends Block
 		}
 
 		if (yp_isAir) {
-			if (yp_block.isAssociatedBlock(this)) {
-				if (yp_concentration != mid_concentration && yp_concentration != 15) {
+			if (yp_block == this) {
+				if (yp_concentration != mid_concentration && yp_concentration != 15 && (!isGrowth || yp_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x, y + 1, z, mid_concentration, 2);
 				}
 			} else {
@@ -293,8 +353,8 @@ public class BlockAir extends Block
 		}
 
 		if (yn_isAir) {
-			if (yn_block.isAssociatedBlock(this)) {
-				if (yn_concentration != mid_concentration && yn_concentration != 15) {
+			if (yn_block == this) {
+				if (yn_concentration != mid_concentration && yn_concentration != 15 && (!isGrowth || yn_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x, y - 1, z, mid_concentration, 2);
 				}
 			} else {
@@ -303,8 +363,8 @@ public class BlockAir extends Block
 		}
 
 		if (zp_isAir) {
-			if (zp_block.isAssociatedBlock(this)) {
-				if (zp_concentration != mid_concentration && zp_concentration != 15) {
+			if (zp_block == this) {
+				if (zp_concentration != mid_concentration && zp_concentration != 15 && (!isGrowth || zp_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x, y, z + 1, mid_concentration, 2);
 				}
 			} else {
@@ -313,8 +373,8 @@ public class BlockAir extends Block
 		}
 
 		if (zn_isAir) {
-			if (zn_block.isAssociatedBlock(this)) {
-				if (zn_concentration != mid_concentration && zn_concentration != 15) {
+			if (zn_block == this) {
+				if (zn_concentration != mid_concentration && zn_concentration != 15 && (!isGrowth || zn_concentration < mid_concentration)) {
 					world.setBlockMetadataWithNotify(x, y, z - 1, mid_concentration, 2);
 				}
 			} else {