So I am setting up my 2 animal plastics T8 cages and I am trying to get the temps right. I have a Radiant Heat panel in each cage, both controlled by a herpstat 2. It seems like it is taking a while to reach the desired temp that I set on the Herpstat. I have tried putting the probe on the cool side and on the warm side, halfway up the wall under the heat panel. My concern is that when the herpstat turns the panel on, it reaches a temp of anywhere from 110f to 140f when I temp gun the heat panel directly. Obviously, when the desired temp is reached and the herpstat is putting 0% power, the temp of the panel itself goes down. Am I doing something wrong, or is this just how it goes with RHPs?