Ceramic Heat Emitters will suck the humidity out quick. Trash the dials and get an Accurite from Walmart, the one with the secondary probe and humidity gauge. Also you measure from snake level, not top of the tank. I tested my Zilla Digital readers and they where off by upwards of 10*f, returned the immediatly and got the Accurite.
I built an acrylic top for my tank when Nova was still in her 40g breeder (jesus that was hard to keep temp and humidity with the screen) and my humidity worked out well but the biggest UTH still had a hell of a time keeping temps. All of my snakes(and the girlfriend's snake) are in tubs now (not enough room for me to have a display snake as of right now, plus my RTB is going to be my display snake and the heating options for their setup are more open and reliable).
For right now you may want to mist the tank heavily until everything is moist, not damp, and periodically mist a little throughout the day. While my girlfriend's snake was in a tank we had to mist 6-7 times a day with a good 3inches of substrate (aspen).
Best of luck!
OH OH! I also stuck the probe part of my Accurite to the inside of the hot side hide when I did tank display with Nova and durring Leviathan's short stay in the tank until I got his tub set up.
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