I house my BP in a 30gal tank with a screen top, I had a major humidity issue too. What I did to fix it was cut out cardboard panels, covered them with tin foil and place them on top of the screen top. I cut them so they fit perfect on top, with a space for ventilation. Its nice because you can move it around as needed to raise or lower humidity.
I also use sphagnum moss and wet it, put it in a small glass dish on the warm side. This helps it evaporate and gives off humidity. I also have a big water bowl. When my BP is in shed I will moisten some moss and place it in the hide with him (not sopping wet, dont want any scale rot or anything). This has worked amazingly for me since I started doing it and I've had perfect sheds ever since!! Good luck!
Also, I've done this with two types of substrate, reptibark and on paper towels, worked great on both.
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