Heat rock....super bad...get rid of it as it is very dangerous. If you have a screen top on the cage try to get some plexiglass cut to cover it and that should solve the humidity issue. Easier than that I just use aluminum foil. You may need a bigger UTH on a thermostat to heat up the warm side to like 92......the cool side should be 82-83. Get rid of the light if you can...that will also help out your humidity. Also and just to make sure....have 2 hides one on the cool side and one of the warm side.
Take a look at the care sheet on this site as it is an excellent source of information. It helped me so much when I first started! Good luck to you.