time to get yourself a real ph meter. Ebay is your best choice. got my Milwaukee 3-1 TDS, PH, EC meter on there for a little over $140 with a weeks worth of the buffer solution. Overwater and lack of calcium are my .02 cents. Don't spray those puppies with just water. It messes with their calcium and looks just like that after a while with no use of ferts. seems like they are trying to perspire the rest of the water out by the edges of the leaves and thus they are curling upwards. thats also a sign that they are too hot and perspiring as well.

look bushy though!

Cheers