Create humid hides by either putting damp moss in the current hides or get a container and fill it with damp moss and put a hole in the top.

I use a tank for my bp and using humid hides gives me perfect sheds. The humid hides creates a micro climate within the hide that is higher in humidity than the tank. I maintain my hides and don't even track the tank humidity now. I Do have a cardboard cutout on to that wrapped in foil but it is more for retaining heat.