Chrissy,
Do you have any type of ventilation goin on? if not this would really help you control your temps and a fan would thicken up your stems. my girl sits anywhere from 77-88 and she doesnt seem to mind it. but i never let my humidity drop below 38% so the plant wont dry out if it is a lil hot. and if she is at 88 its not for long. Normal temp is about 82. droppin your lights may burn your plant sice its a 400w but if your not opposed to it you could add a few cfl's keep them within 2-4 inches from tops to get them bushyer but then again im kinda new at all this too so some may disagree but hope i helped ya a lil peace