I would say you need to lower the temperature in the room, I personally would aim for under 25c with a fan. They seem to be showing signs of heat stress. Witch can cause a whole slew of other issues.
I hope this helps,
Good luck on the grow! 👍
Your running your autos to hot. Autos only need a little ferts to keep them going. Check your runoff waters ec and ph. Get your nutes down to about 1.4 to 1.6 ec. Cheers