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Paul,
It would be useful to post an image so that we can ascertain whether it is in fact field rotation, or another issue.
Field rotation over that length of time is most definitely a result of less than perfect polar alignment. Less likely, but theoretically possible, is flexure over a long enough time, and in a direction that mimics the effects of poor polar alignment induced field rotation.
A non-orthogonal optic won't cause field rotation. It's the polar axis - pure and simple - that needs to be aligned with the pole.
Just out of curiosity, are you using Protrack?
I suspect it is you polar alignment.
Post an image or two.
Paul
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