I have a 40 in my living room with the same issue. I added moss to my hides to create humid hides and now all is well.
During non shed times I will mist the moss every few days and let it dry out and then mist it again.
During shed I soak the moss and keep it damp throughout the shed.
Doing this I have perfect sheds even with a tank humidity of 30%.
I do have my screen covered and use cypress mulch.
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