So, to bump up my humidity I just crumpled up 4 paper towels, got them wet, and put 2 on top of one hide and then 2 on top of the other. Bumped total humidity very well. You could put the towels in the hides, put moss in a small container in the hides; really, just get the humidity up and the temps also!!
I would *not* replace the hides with something different as this could lead to the snake getting stressed out by the change. It's all good. Try the paper twoel trick (unless you moss hanging around...haha!)