Don't buy the snake today.
You did not mention humidity. Do you have a hygrometer? It should be 50-60% humidity. A lamp will kill your humidity. You need belly heat, so the uth is good to keep and is good you are regulating it with a thermostat. You should be reading the temp on the glass floor, not on top of the "forest floor". It could very well be 108f down there and the snake will get severe burns if she burrows (and she will).