It’s saying: “my leaves are stressed every day & by the afternoon/evening i’m worn out but after a good sleep i feel normal again”
My guess is that the low(ish) RH% and leaf temperature are what need examination; with all other factors being optimal, that would be the limiting factor, imo(right?). And there’s that black plastic; Black raises temps 4-7 deg. F. & it could be increasing your air-temp at the micro-local level.
If you have a non-contact/laser thermometer I’d check leaf temps & plot them along the photo time-line… or just raise the lights, change the air-circulation & start misting.
