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Agreed, good setup and great polar alignment are REALLY helpful. I had an interative learning experiece from plate solving. I started using plate solving to get correct for poor pointing, then found myself studying the plate solving situation regularly to learn what helped get better alignment. If I'm setting up somewhere for 2 days or more I now run an auto-map/sync to EQMOD using Pinpoint platesolving, but generally for astrophotography on a single object you're ok with point, sync, repoint (unless you'll be attempting automated meridian flips or something).
I would have said you're looking at more like 10-20 arc minutes accuracy, but perhaps the greater variation is just flexure in my mounting.
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