I never go above 75-76 in flower as the transpiration rate with the light maxxed out means at 76+ you would need a very high humidity to maintain proper vpd, so I would really try to keep it 76 and below if possible. Other than that, I guess the idea that "less is more" really is true with these plants as Im learning myself. That plants leaves look fine to me, and as you know new growth is always gonna be lighter color. But if its not darkening up as it grows, then I would think it needs more nitrogen, or something your giving them is making them not absorb enough nitrogen, MOST times Ive read about its PH. Might as well call growing "ph management" its so important. What Im doing is cutting down on all my supplements, running basic nutrients, and am only gonna add new stuff once I get the basic nutrients down pat. You could do similar, but then again we all have different ways of getting to harvest! Its cool u are trying, never know unless you try :D