Great. I'd center your light for the ambient temps. In the picture above on the left is one of my remote thermometers.
I have 80-81 on the cool side and 90-91 for the hot side.
If you need to insulate the bottom and rear with an inch of styrofoam and Refletix.
I even did the back, bottom and top of my plastic boa cage just to keep my heating devices working more efficiently. I had the stuff so why not use it!
Good luck.