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Bart a couple of things to remember.
1. If you are not accurately polar aligned (and I mean significantly >1 deg out in Alt or Dec say) then your autoguider may not be able to keep up with the drift. I have seen this a number of times where the autoguider calibrates successfully but during the imaging run doesn't have a hope of keeping up. The trick is to get polar alignment as accurate as you can. ie learn to drift align.
2. The further out you are then the greater the amount of image that will show rotation (assuming you can autoguide). The trick is to get polar alignment as accurate as you can. ie learn to drift align.
3. The further away from the imaging area you are guiding from, even if you are well polar aligned the more rotation you will observe. Generally you won't see it in the image but when you stack them you will notice that each image may be slightly rotated compared to the previous one. It makes if very challenging to carry out multiple night imaging runs and then try to combine all the runs into one image. If its possible try to autoguide with stars that are close to the center of your image if you can.
In your intro you didn't say if you were imaging with the G star or wanting to autoguide with it.
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