I don't think you'll necessarily need to unstick your UTH. I also have UTHs with the adhesive surface, and I just place the probe flush against the UTH. In order to help keep the probe in place and as accurate as possible to the UTH's temperature, I create a little "sandwich" as follows:
Outside surface of bottom of tub/tank -> UTH -> probe -> small square of styrofoam -> heat-safe tape to hold the styrofoam in place
I also tape down a section of the probe's cord so that the probe can't get tugged out from under the styrofoam square. With this arrangement, I have my Herpstat set to 88.0 F, and find that the surface temp for the hot spot (measured with an infrared thermometer, as fadingdaylight recommended) matches up pretty closely, right between 88-90 F.
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