I had the same issue. Sorry I only read from the top of this page so if u explained that u were flushing, etc. my apologies. But yes, this happened to me too. I had a mostly sativa plant that I chopped at the same point as you. My problem: 1. bad genetics (crappy mids started by accident) 2. after flowering began I waited waaaay to long to start flushing and prepping for the chop. 3. Once I did flush w/ "Old Bitch" Molasses the plant did precisely what yours did. The larger leaves that were left on the plant after the long flowering, died and crumbled in one day. Prognosis: Given that the flower cycle was so late ( I wanted to get the biggest punch from the crappy genes, they probably went too long and actually lost some punch) the molasses and excess H2O really fucked her up. It was my first grow and I learned a lot. My second grow however started much better, that is w/ much better genetics and very little nutes. Remember you are growing with CFLs and the plant is likely not gonna use a bunch of nutes. If you insist on more nutes do it gradually and get her acclimated to the condition. Please understand that I am no more experienced than you and I am just sharing my minute knowledge and the actions I suggest are simply what I have done differently. You definitely grew a nice plant there and like most ppl your next will be even better. Good luck. Oh, Ill add some pics, 1st-the old girl that was afflicted as was yours. 2nd and 3rd the 2nd grow. Oh they joy of good genetics! I have trichome pics from my veterinarian's microscope. The 1st plant, 2 weeks before harvest had mediocre trichs. The 2nd plant, after 5 weeks flowering had three times as many. Let me know, I can shoot those to you if interested.