Leaves turning yellow, the whole plant too!

After reading your diary I noticed two things one is you may be giving them too much nitrogen for this stage of life as they start to flower you want to back off the nitrogen some eliminate the gro all together. Another was the issue of the lights being too which causes light/ heat stress, which can cause some crazy problems. Most plants suffer when the temp grtd hot enough for a certain period of time. It causes irreversible damage by way of plant function or development. This isn't merely droopy leaves in the heat of the afternoon; it's things like stunted growth, leaf drop, leaf scald, failure to flower. Hopefully, I answered your question and remember " Happy Growing and Free your mind one puff at a time ".

After looking at your diary, the plant looks like its yellowing from the top down evenly with green left at the bottom with a few leaves with what appears to be nitrogen at the bottom. It looks like some sort of lock out to me. I would verify your soil PH, and not the input water/feed PH or the runoff PH, but the actual soil PH. This can tell you a lot. You seem to be feeding a good amount, which a lockout would explain why the more you feed the worse it gets. Immobile nutrients are topdown and mobile bottom up. You appear to have both going on, which points me to PH.