OK, heres my thoughts on what I see. The probe is taped to the Flexwatt, but only a portion of the probe is actually making contact with the Flexwatt. The rest is being exposed to room temp air and the heat coming off the flexwatt. So the Herpstat is heating it up more to get the right temp. Take a piece of aluminium tape and cover the whole probe, that way the heat will be trapped all around the probe and you should get a closer reading.
Just my thoughts, correct me if I'm way off base here!
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