Are you using an analog temp gauge or digital? The temp you are reading could be ambient temp not the actual temp by the uth. I have a 20 lomg and my temp on hot sode is 90 to 91 and cool is 83 to 85. Ambient temp is around 85 my humidity is a constant 55, unless shes shedding then I raise ot with spritzing with warm water 2 to 3 times a day. I also have her water in the middle of the enclosure which helps with the humidity. I have a 60 watt red light and uth. I also cover 3 sides and most of the front so she feels more secure. Moss all over and in the hides on each end, and 2 digital temp humidity gauges. I try to keep her happy as a bp can be. She can go in either hide or under the water dish. She also hides under the moss.