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Ken, I think your rubber bands might have a bit of explaining to do.
I was just looking at a single frame that you posted and noticed a sort of embossed effect. So I am wondering if you have applied any flat fields to the individual frames?
Granted it looks somewhat like rotation, but then again not really.
If I apply a mild amount of offset filter to the a/c image I posted I get nice round stars in the foreground with a stipple textured background.
It might be worthwhile going back to your original frames from the web cam (avi?) and redoing them. If you are calibrating, you might try stacking them without calibration to see if there is a difference. The amount of field rotation across those 8 frames is not beyond the alignment capabilities of s/w so I think you need to look at other things.
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