I'm not certain what you are saying, really. If you are saying that your warm side, inside the hide, is 85-90F, my response is 85 is too low and 90 is my lowest; though my warm side is more of 91-92F and that is the temp of the entire warm side, not only under the hide. Then the gradient happens, gradually temping down to about 82 on the cool side as well as that temp under the cool side hide. I'm uncertain if this description helps you, or maybe leaves you scratching your head....