i dunno, i think they look great. but are you going to mother them or what? what are they, 16 -18 inchs tall? i do 9 under 1000hps and i would have gone to 12/12 already.
i think weed is right about the ventilation combined with the spraying and humidity. if those were mine id clear out some of those ugly leaves from under the canopy. when i grow kush in winter i get some leaves looking like that on the center plants. i clear some of the lower stuff and set up fans lower to help push air in there. bushy bitches that love to grow mold, but i love babba kush.
i run GH w/ 4-5ml of calmag. my ppms run 1300-1400 (@1000 in summer) and dont normally need to flush (except for summer) but i do flush if i ever think somethings wrong and dont know what it is.
try to get that humidity down but man i think they look great.