Keep it between 50 and 60% humidity. 70-80 is way high for a ball python. I'll bump up to about 65% when Furio is going into shed.

In my experience with Furio he will eat going into shed and still shed just fine. If you say there is alot of shed around his tank and he still has some on him it may be stuck on there and you might have to help him. Give him a day or 2 to relax. He'll finish his shed. He just needs a little time to digest. In the meantime don't handle him just let him be.