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And don't forget to tighten the latitude control after PA.
Recently I saw small trails on all sub frames, but when breaking up the setup after imaging, I realized I forgot that after proper PA, so when pointing to a star, the latitude was 'changed' somewhat, resulting in tracking errors.
Polar alignment is crucial. The south pole is even easier for me, because when I center the +6.9 BQ Octantis (not Sigma !), only 10' off the real south pole, it is accurate enough to make 4 minute subs on 600mm without trails.
At the north pole I have to know the sidereal time to get Polaris at the correct direction 40' off the real north pole.
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