Are you measuring the temp on the under tank heater or the air temp? I've seen the heat pads heat upto 115 degrees without some type of thermostat on them. This could be why your snake is being so active. Someone mentioned this but I couldn't find what you were measuring temps with. It is best to use a digital thermometer with a probe. I place the probe under the substrate on top of the UTH and then place the head unit on the cool end to measure ambient temps. It should all be in the caresheets and links that starmom gave you.
Welcome and congrats!