When in doubt.....go low. If your plants have a def of some kind you will see it become more pronounced if you put your plants on a very low nute strength.....ph correct always of course. If the problem is overnute/overwater you will see them improve when you do this (and of course....back off on the watering) The way I was taught was.....undernuting will make your plants sick....but overnuting can kill them right off so when in doubt......go low.

If the temp IS at the top of your leaves however and it IS over 80 then you should definitely be thinking about a little less heat but as I said I can't look at the photos so don't discount what other good growhead minds are saying. ....do you have a oscillating fan or something blowing to help cool?