I see concrete and cellar insulation? Are you in the cellar? Are those plants on the floor?
Potential problem #1: Cold feet. IF your temps are dipping to 60, and that is a cellar, I'm going to assume that the floor gets even colder and/or stays steady at a temp colder than the room itself. You MUST lift plants up off a cold surface like that. Shipping pallets or milk cartons are ideal. Cold+wet+pH imbalance=dead.
Potential problem #2: Shoes too small Give one gallon available soil space per foot of plant height. Canoed-over leaves are a sign that the plant is pot-bound. Plus when the root mass has overwhelmed the available space, soil chemistry starts to suck big time. You will not be able to control pH as well, since the relatively large mass of living material in the pot is actively uptaking nutrients and water and changing conditions.

Okay. Bigger pot. No contact with cold floor.