New grower problems

First time grow three clones under 600 w hps..not sure what the issue is but I believe light burn or heat stress possibly they don't seem as healthy as they could be but light is well above the recommendation about three 2.5-3ft away and have 6" hurricane exhaust and and oscillating fan to help circulate and it doesn't seem to hot in the tent. any help appreciated moved it out from directly under light for now until figured out could it also be an humidity issue?
 

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Grow medium, nutrient use, water type, ph level, temp/RH?
It's in ffof with extra perlite and Coco cior. no nutes goin to be added till budding. pH varies between 6.3-6.7 and as of now the temps stay between 70-80 they where getting to low 90s Wich was my problem I believe and my rh has been 40-50
 
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