Your going to have to try and load some photos of the enclosure. I thought you were using an mvb, which is a spot bulb and uvb in one. Still, you have a spot bulb that is probably drying out your tort and the surrounding air under the bulb. Need to see your set up.The pics are not the exact ones I use, those types. The uvb is in a desk lamp mounted well above the enclosure and the lighting \heating bull is in a dome fixture above one side of the enclosure
The room you said was 77f. Is it constantly 77f or is it weather permitted to what temp it's at. What is the humidity in that room?