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Paul.
I find this a bit with my ST10 at 1800mm fl when the seing is poor
Yuo must remember that when you are watching the guider image, it is also at the native focal length. There is much more obvious movement of the star compared to when you are guiding through a guide camera at a much shorter focal length.
Try watching the guider image with the guide cable unplugged so it thinks it is correcting but isn't for a minute or so. You will still see it wandering from side to side as if it is over correcting. This is just the exaggerate seeing effect at the long fl.
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