I'm flowering in a 5 x 9 Gorilla Tent with two 1000w se hortiluxs, both in their own Magnum 8" air cooled reflectors. 8 plants in there total.
I might try to experiment with the soil mix. I havent been using this method for too long really. The idea initially was to be able to finish a grow from start to finish with water only. But after I saw my yields skyrocket, I figure I'm gonna ride out this method for a bit. Plus, I've read that when using 100% organic soil, it's hard to get a fade on the plants. Where as now, they fade as soon as I stop the bottled nutes.
I used to only use the bottled nutes with no amendments added to the soil, and I can definitely tell a huge difference now with the amendments added. Because now the plants swell up a helluva lot more during the straight water for the last two weeks. My yields went up 2 to 3 ounces per plant with organic soil added.
I thought the fade was to allow the chemicals that are concentrated in the leaves and flowers from added fertilizers to leach out with flushing over an extended period of time. If there's no added chemicals, my understanding was that there's no harsh chems that that need to be leached out so no need to fade. My experience and knowledge base is rudimentary at best though, so this is truly a question from me, not any kind of lecture or whatever.
I think I've also read that the plant responds to the stress of the ongoing starvation during a fade by doing everything it can to get flowers fertilized before the end comes, resulting i guess in bigger, more dense flower heads. That seems to suggest there's some complex "behavior" that goes on during this plan't flowering phase of life.