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Mike,
Your PAS doesn't sound too healthy.
I pitched my posts at the theoretical side as I thought you wanted to calculate specifically how much drift/rotation would be present for a given focal length etc etc. Don't be scared by the data I've provided - its certainly not too hard as you put it.
I guess the question you need to ask is - do you see field rotation in your images now? If you're using short focal length camera lenses, then your statement near enough is good enough is probably fine. Perhaps start imaging with the shorter focal lengths as they are more forgiving than longer focal lengths (tracking, seeing and polar alignment). As you advance you can progressively improve your polar alignment accuracy and use longer focal length instruments.
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