Stephen
Based on your posted PE graph from PERecorder several posts before, it looks more likely that your mount's PE is actually aro 30arcsecs peak-to-peak and therefore the average is aro 15-20arcsecs which is quite normal for the EQ6 -auto-guiding will definitely be able to guide out for you
It is when the graph is not sinusoidal that you should be worried about your PE
Yep your drift alignment is still not spot-on when you still have drift - generally it is better if you test the alignment for drift for at least 5mins rather than 2mins to ensure that it is 100% spot-on
HTH
Cheers
Bill
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