maybe i keep my humidity at 40% in flower, 86 degrees is a little high especially if your not using co2, i like to keep my temps at a constant 79degrees and when the lights go off it only goes down to 70 if that, i think something is wrong if you only got 500grams for 2000 watts of light, can you post some more info like what kind of nutes and how many plants stuff like that, it would help alot, Thanks Bigworm