The heat panel is going to be hotter than the hotspot it creates. Its has to be as it is throwing the heat down to heat the surface below.
I have good luck mounting my tstat probe inside a cable strap with super glue and then super gluing the strap itself to the rim of the rhp. The tstat probe does no touch the rhp. It floats just below it. Once mounted I start off low and slowly raise the rhp temps until in is where I want it. A rhp will be warmer in the center and cooler on the outside edges which is where the probe will be. That means the tstat may only be set in the 80s but the hotspot will be much warmer. That is just how this technique works. I have used this without fail for years.
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