Like mentioned above the levels in the hide are higher than your gauge is showing. The hide is where it matters. I don't even monitor the humidity in my tanks anymore. Its in the 20-30s but the hides are good and that gives me great sheds. Worry less and enjoy more.

You can also use a thicker layer of substrate in the tank. All of my substrate levels range from three inches to a 1/4 inch. In my BP tank it is built up and thicker on the cool side and tapers off to the uth on the warm side. In my Hoggy tank it is all thick and allows her plenty of material to tunnel through and create her own caves and caverns. Then in my GTP cage the substrate is about two inches thick all over. Doing this allows the substrate to hold more moisture and gives the snakes something to root around in if they desire.

At one time in my BP tank I created an underground cave from super thick substrate, logs, and a hide. The BP loved it but I NEVER saw her again and it was to hard to get her out. It looked cool though.