Are both vents open during lights on then closed lights off,in the tent,my room runs hot ,but that is because its in the same room has the hps room,the hps room's heat is vented into the area the tent is,so it runs around 27/28,but has long has the plant looks happy don't worry,the slight leaf curing is not a problem don't worry about it see if it carry's through to the next sets of leaves before doing any thing,My two are both near the same height has the clones now,a couple of inch of,but in the next week or so they will all be the same, its at this point that i start the topping process of each plant to keep them same height,My grows i have going now in the tent and in the hps room have not been topped once and there doing brilliant.put a table over it and train during the first 3/4 weeks of flowering, like i do its how i can grow big plants,in small areas but get good yeilds.and keep the height under control.Too small top,it could be done but i would not do it till its a bit bigger