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HELP! Crispy, curled leaves and now, yellowing spots

Hey all!! I have a few concerns that, I hope, this forum can help me with.

Back story: I was stuck at work for a few extra hours on watering day (2 gal water into 3 gal pots. PHed to 6.3-6.5, water or feed every other day) When I got home 3 plants were drooping from lack of water. I immediately put some ro water on them. When the leaves came back up, they were curled and crispy. Also, the room temp was 90f and th humidity was around 60%. This is the first 3 pics.

Now, this morning unnoticed some yellowing spots on the plant next to the ones that dropped. Also, this plant has some minor curling to the leaves that were closest to the drooping plants. Temp has been staying between 85-90 degrees when the lights are on. Humidity is between 40-50% when lights are on and 50-65% when lights are off.

i need to add that the whole room suffered nutrient lockout last week and was flushed with 6-7 gallons per pot. I've fed once since the flush. I'm running advanced nutrients A&B, b-52, big bud and carbo load with terpinator. My ppms before the flush were over 2k and the runoff was between 1600-1800ppms. The last feeding, I cut back the nutrients to half and my ppm dropped to 1100ish.

I am running 4x1k/w magnum hoods with HPS bulbs. The lights are 24in. above the canopy.

I am running 4x1k/w magnum hoods with HPS bulbs. The lights are 24in. above the canopy.

Any help explaining how I screwed up and how to fix whatever the problem is is greatly appreciated.

Thanks for the time!

https://imgur.com/a/DZgE7
 
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It sure looks like heat stress but I ain't positive yet ,but if it is that's not good when they are flowering.You will get less yield. You have got to get the temps an humidity right , those are pretty plants too I would sure be concerned. What are your plans ?
 
I'm purchasing an air conditioner for the room and have moved the lights up a few more inches in case it is heat stress. I have a dehumidifier in the room, but it is having a hard time keeping up. Probably going to add another one. I'm 5.5 weeks into flower on my first grow here and I'm getting my ass kicked with all the issues I'm having. I just want to get through this harvest and learn from
My problems at this point.
 
I'm running 16 plants. 7 Kandy kush and 9 Girl Scout cookie. This is my first run in over 12 years. The pots didn't get dirty until I did the flush.
 
Damn, that's alot of plants ,reason I mentioned the pots was you might have root problems with to small a pots, I don't know that though. Looks like You got a job ahead buying air conditioners and d ehumidifiers but with all those plants it will be worth it if it doesn't affect your yields to bad. I wish you all the best man you ain't got to much longer , hope you get everything right and have a nice harvest.
 
I'm not even sure it's heat stress it looks like it to me, whatever it is I don't think it's to bad , ph is good, your feeding her properly, you gave her a good flush, if she was mine I would just back off the feed for couple of days and go easy on the nutrients when you you start back feeding her but that's just me . You can check out Nebulas articles on problems on GWE she's got pictures of every leaf problem there is, looks like heat stress to me and heat stress can cause root problems. But I think you might have caught it on time if that's what it is. Check out her pictures it might help some.
 
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