Hey There - To create a better heat gradient I would maybe suggest moving your CHE towards the center of your tank or over the cool side to heat to at least 80 or so. From the sounds of it you don't have any supplementary heat source to create warmth on the cool side of your tank. A UTH on the hot and the CHE over the cool should create a nice temp for your cool side substrate and depending on wattage maintain a reasonable ambient air temp through out.
What wattage CHE are you using? When I was using a 100W I was having trouble with overheating and had to hook it up to a dimmer to control the temp. Ended up switching to infrared lighting though as it didn't kill my humidity like the CHE.
I'm no expert, but when I first set up my tank I had to play around a bunch to get my temps/humidity right.
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