I think you may have several problems going on.....the curling leaves and edges could be due to overnute/overwater/ph issues. You'll either have to correct all three or correct them one by one and see what straightens out and what doesnt.

Really NOT a very good idea just to add a ph adjustster indiscriminately (sp?) unless you ARE checking your ph and making sure you are adjusting it to the correct level....between 6.2-6.8 for both your soil and your water. Id slow your nutes WAY down and not water unless the plant soil appears dry.