Try aluminum foil for the tops, to help maintain humidity. Mist a few times a day too, or get moss. I noticed it helped bring down some of my temperatures, temporarily. My setup is almost identical.
Do you notice that your BP has a preferred hiding spot/side? Or does he switch off. Reason why, I was curious, I have two different hides too, and he sticks to the hot side. So I was wondering if that was normal.