What are the cage temperatures? what are you using to measure temperatures.
UTH's applied to the side of the tank don't really do much (heat travels vertically not horizontally) Plus UTH don't effect the air temperature in the tank. UTH's are best when used under the tank. UTH's must be regulated by a thermostat. Without a thermostat regulating them they can get hot enough to kill a snake.
Here are some good thermostats. Stay away from the junk sold in pet stores.
Budget: http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
High Quality: http://spyderrobotics.com/home/products.html
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