If your temps are too cold, why not try supplementing with an over-tank light bulb? i found that my header didn't provide enough overall heat, and a day/night light fixes that problem.
1.1 ball pythons (Huxley and Marla)
~"Interestingly enough, the only thing the bowl of petunias thought was, 'Oh no, not again.'" --Douglas Adams~
* Mollie *