Have you considered relocating the temperature sender? I was never happy with my temperature readings and it seemed the the location of the sender in the head was in an area of variable water circulation. Readings seemed to vary from water temperature (with flow) to head temperature (limited flow). IR thermometers are a neat tool!
I relocated my sender to the outlet from the manifold. I put in a tee and screwed the sender into the side of the tee. Not once did I have an urge to move it back to the head.
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