I'm not using a temp gun yet. I just ordered one from Reptile Basics about 10 minutes ago. My Acurite says the hot side is 87*, t-stat is set at 90*-91*. I know to go by thermometer, not t-stat read out. My concern is that big, nasty heat spike around the foil taped t-stat probe. It read 95*+! What if I was just to tuck the t-stat probe between uth and glass, eliminating foil area heat spike? I appreciate the help, man!