Punta de hojas amarillas

The yellow tips are from a slight nute burn - I'd reduce the amount of nitrogen you're giving them.. the other photos seem to indicate a couple of deficiencies which will most likely be taken care of with 1) the reduction you did to your pH (good move) and 2) reducing the nitrogen. Excess nitrogen can, for example, cause a lock out of calcium which is one of the deficiencies I think I'm seeing. The leaves won't repair themselves - i.e., they're always going to look like this - but you shouldn't see OTHER leaves becomeing damaged. Good luck!