In the pics, I actually don't see serious issues.
You have really good resination even on the fan leaves.
The odd numbers are pretty much to be expected during flower.
The twisty leaves at the bud sites may be either strain related or a sign of a problem. Some strains just do that naturally.
I do see damage that looks like it is from thrips- white freckles on the leaf surfaces.
There's no sign of any reason for the stem bases to be rotted.
The room setup looks great, if a bit full. With adequate air flow, even the crowding shouldn't really cause trouble.
That one plant that was wilty- did it recover after dropping the light intensity? Stupid 'is the unit plugged in' question- had that res run out of water? (sorry... had to ask lol)