Okay, so I do have a little thermometer that I put right outside of the log to measure the bottom heat right there. At the moment it is 90 degrees. I slid the log up against the side of the tank so that there was no opening on that side. However, I do notice that sometimes he likes to wind himself through the log. He will have the tip of his tail hanging out of the back and lay half out of it. I will also look into getting a hide for the other corner of his tank, next to the water dish, and I will look into a thermostat.
As for the scale rot, so you not suggest that I change anything? Should I not put down cardboard or paper towels under the substrate? I also mist his substrate whenever I see the humidity getting low (the humidity is my biggest problem), and in order to keep the sides of his tank clean, I spray right down onto the substrate. Is this a problem? Could this be making it too wet?