Hello everyone I am proud to say that today I got my first ball python (a pastel) and I have just moved him into his tub. however a couple of issues have come forth since then. first I cannot get the temp. above 81F which I know is too cold for him (btw I am using a zoomed reptitherm 10-20g UTH on a 27 quart tub). Also an issue is the fact that I cannot get the humidity down below approximately 70% here is a more detailed list of what I am using and any help and advice would be greatly appreciated.

Tub = 27 quart tub
Substrate = Aspen snake bedding
Hide = Half Log
Heater = Zoomed Reptitherm 10-20gallon under tank heater
thermometer/hydrometer = Acurite digital
Age of snake = 5 month old baby Pastel Ball Python
SOMEONE PLEASE HELP ME I LOVES THIS SNAKE TOO MUCH TO LOSE HIM!!!