Easy way to cope with humidity is to simply add a humid hide. Simple to make too, just get a coolwhip container or a tupperware container, cut a entrance hole and fill the thing with damp paper towels or moss.
Whenever the snake feels the need for more moisture, it'll curl up in there (sometimes it'll like it too much and you'll have to take it out occasionally so your snake doesn't get blister disease).
-Lemur 6