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Did you have this problem prior to the hypertune?
It happens to me most of the time - I have always thought it is caused by differential flexure, backlash or just ineffective guiding?
My biggest problem is trying to guide 2350mm fl with a 400mm fl guidescope and the nexguide which doesn't guide to sub-pixel. Sometimes it guides perfectly - other time I get drift.
Are the stars oval in any particular direction (RA or DEC) - that may give more clues.
I think I have read a report that the CGEM mount doesn't have good guiding in DEC the latest mc firmware is supposed to improve this?
Regard,
Tony.
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