There is an article on auto-calibration of TRVs here Your TRV is lying to you: TRV auto-calibration - NotEnoughTech
While the TRVs and sensors used are zigbee the concept and ideas are still relevant and could be re-done for the Shellys with no bother.
I started looking at this because the TRVs used are the same as I use and there is a whole series of related articles.
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