Leaves withering a little. Curling. Buds look ok

I'm in the 7th week and I think I might have over nut'ed them...? The leaves started curling, probably from heat stress. But they also started loosing color and decaying(?) in some spots (limited areas).

Here is a link with details: https://www.rollitup.org/indoor-growing/405341-third-times-charm-whatcha-think.html

Buds look great, though. Or maybe this is just what happens when you get close to the end....?

Thanks for the help

Any suggestions?

since they're in half MG perlite and half MG organic soil. I was thinking of just using water for the remainder of the grow. Maybe some florolicous bloom too...