Deficiency, Burn, or what?

I've just recently flipped these girls into flower. We had left them in the care of a friend for 10 days before that and he definitely over watered quite a bit. I figured no big deal let them dry out for a few days give them real oxygenated water and everything will be fine. Well everything was fine until we put them into flower. Obviously we flushed before the nute change and Ph is fine as far as my meter is telling me. This problem is only showing up on my three Grape Ape girls every other plant is really healthy and loving the new nutrient schedule.

So please if you have any advice I would greatly appreciate it.
Left is the most advanced leaf on the worst plant right now, right is the beginning stages. The problem basically advances until the whole leaf is brown dead and twisted.

Happy Growing!

First thing I think is pH, or maybe a toxicity of some kind or maybe a K def...either way I would try another flush and maybe tweak its feed,not all plants will like the same nute schedule...