I leave the humidity thermometer in all the time and do change it's positions some. It's a 12" habitat. I have ordered the thermostat control, the CHE as well as a new uvb uva bulb just to be safe. I am guessing the the che, I won't need the blacklight any longer. I am thinking that what you're saying about the regular heat lamp bulb bearing down on her might be the culprit. She does have a hidey house that is thick plastic and not see through that she goes in and digs down in the substrate in some but she also spends a lot of time on her ceramic tile directly under the basking bulb. She has a cuttlebone she chews on every now and then. I feed a combination of 2 types of spring mix. I've tried other things and she is picky. No other supplements.
The other poster was referring to your temps not humidity levels.
Your temperatures might be too low elsewhere if he spends a lot of time basking under a light. When my temps are good, I also didn't see them directly under lights very often. It was usually first thing in the morning only.