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I gather what you are saying is the guide scope should be centered on the target or at least very close to the center of the image and the guide star should be as close as possible to the center of the field as is possible to avoid some out of synch between the guide star and the imaging camera.
This would make sense as the polar aligment is centered on the main imaging scope/mount and probably should have the same point of reference/rotation. This would account for the good results gained by using an OAG/ internal guide chip.
Food for thought. This could be part of my problems while trying to stack LRGB images. I might have to break out the OAG that I hate with a vengence or put the guide scope rings back on instead of having the guide scope bolted down to the scope rings.
Thanks Marc.
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