Thanks again,
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I resoldered all eight points and now I get proper SWR readings! I didn't find where to measure ADV_REV and ADC_FWD but I now get good readings that match my NanoVNA (at least where the sweet spot is). So problem solved!
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Now I got another idea - to find a way to have the esp32 that controls the motor for the magloop tuner stop excactly at the point where the QMX's SWR measurement is the lowest.
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:)