Aye, re pot that sucker. Once dry enough to pull the pot, do it! :thumbsup: You'll likely find roots clinging to ALL the edges of the ball. Once in the new pot, with extra grow space. It'll just take a couple days to recover and look great again.

Technically high temps just cause the plant to evaporate more water through the leaves. Thus making you water more often. However if it gets to hot it can hurt the plants. Most people just use a fan to pull in cool air.

I think your biggest issues are the tiny pot, and the excess humidity at night (Thus risking molds and such).

The yellow crispy leaves at the bottom are likely the nute burn. Just reduce nutes and water with straight water a couple times before using ANY nutes.