You may be surprised with the UTH temperature. Go to Walmart and get a thermometer with a probe. Put the probe over the hotspot (check both underneath the substrate and over it) and look at the temperatures. A stick on dial thermometer on the cage wall won't tell you the hotspot temperature. Also controlling the substrate isn't the answer, controlling the UTH is. Get a thermostat to control it. As said, a Ceramic Heat Emitter will help with ambient. The UTH can raise the ambient temperatures, but it is going to boil the floor and burn your snake.
Here's a picture of a burned snake:
That's really not something you want to mess with. Grab a lamp dimmer with a plug on the cord until you can purchase a thermostat. You can measure the UTH temperature with the thermometer probe, and adjust (very light touches on the lamp dimmer).
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