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I am not sure you can move the secondary that far to have an influence on the required distance.
Focusor sounds alright but it could be the adapters. I am a little amazed that the rotator has fit together adapters and not screw threaded. I recently checked one of my images on CCD inspector and it reported I had miscollimation in my refractor images. I thought that was puzzling and so when down at the observatory I was checking over everything and noticed that there was about .5mm of warp on the camera side adapter from one side to the other. So it is worth a check.
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