Your temps are to high, my plants had some heat stress from a spike to 90*F a few times. I started using FL tubes and now use tubes and about 15 75w CFL's using horizontal, vertical mounting and in floodlight domes and they are about 1.7" away from the top of the leaves. I would say work on getting your temps to be around 68-70 and spike to no more than 80. I keep my grow room between 70-78*F Are you monitoring humidity?