Try and get it a little warmer. 75F is about as low as it can safely go, see if you can get it up more to 78-79F. UTH and lamps can work together, that's what I'm using to keep my boy's ambients up ATM; though I'm using a CHE since they CAN see red light and some snakes WILL react badly to it if they have bad nerves or other stressors.