My ball is in a 40 gallon tank in a room that stays 68F. To give the temps I need I use a uth, 100watt che warm side, and 60 watt bulb on the cool side. I covered most of the screen lid but my humidity suffers and stays in the 30s using cypress mulch.
What works for my is adding moss to each hide. During a shed I keep the moss damp and while not shedding I wet it and then allow it to dry out before wetting it again. This crates humid hides and gives my ball perfect sheds even though the tank humidity remains low.
Adding moss and occasional misting should work just fine.
I feel heat is more important in the situation you currently have.
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