And what are your general numbers now day to day? I've burned my plants (say not so ) and the ph will usually tell me where I am at with that process....it will rise, stay high for a while, then slowly start to return to normal as the plants recover... (yep, done it more than once too ) That strikes me as more logical than heat because your burns are very uniform on all your leaves.

As for your insect problems I'm very VERY sure Rhizome and Stinky can answer your q's on that better than I can.

Good luck.