@MesaBoogie They are very wet right now, as I just flushed them, will let them alone for the next few days to see what happens
I was about to give her a 1/2 gal of feed, but you think I should wait a few days?
Fed two days in a row, flushed on a third day and you're considering feeding again on day 4 or 5, this is not good decision making - it's not a fully realized plan. I'm not very experienced, but I believe you and the plants could be better served by not being so reactive. You had issues, but the constant correction attempts are going to create new ones to chase down later and maybe muddy the symptoms of the original problem(s). Which you decided was overfeeding based on the flush you did - but you might consider using weak nutes for the end of the flush, not plain water.
Have you checked the temps from your lights on the top leaves? I know you've looked into it, but I still have to say the lights seems close. Why are you foliar feeding neem? Good luck untangling her issues!
Same symptoms,... and OF is too hot for them typically,... OF often has badly off pH, and mentioned before,... gotta get the right gear mate, that soil pH probe is key,... it would solve this mystery quickly I bet, unless the soil is mucked in other ways....