I personally think cocofiber is really good. Obviously you have a humidity problem, and that's just because Colorado heat sucks :v
I keep my BP in a 20gal tank and I only have to mist it weekly! (Well, to be fair, I live in Indonesia, and the humidity here is perfect) I suggest putting a shallow waterbowl near the heat source if you haven't already, the damp-cloth technique, and maybe even misting if you want to.

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