Pete -
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I've since refined my PA - the PA report suggests that I can lower my mount 1.8 arc minutes while az is excellent. This gives me Sky RMS of 92.2. This is with a 20 point model
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92.2 arcsec RMS is a very poor result for a Paramount, so there's obviously a lot to get right before assessing ProTrack results.
Do an all-sky calibration run of say 200 observations and see what TPoint Super Model says. And after adjusting polar alignment do a "recalibration" (as opposed to a full calibration), selecting the portable-mount option. This will retain your hard-won existing model and just tweak the ME and MA terms (plus IH, ID and CH).