Ok so I'm confused. I have my uth set up and have a heat mat thermostat. Now when u set it to 90 degrees the hide doesn't get to 90 with the substrate over top of the mat when I use my infrared temp gun. When I set it to like 102 the hide gets to 90. I guess my question is, do I worry about the hide temp or set my mat to 90 to what it's suppose to be and leave it at that?