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I really cannot say what the issue is but Occam's law is usually the culprit.
I was having trouble with eggy stars on my G11, getting slowly but gradually worse over time. Eventually found my WO guide scope rotating focuser screws were loose....I could slop around this focuser by more than 10mm at the guider camera. I had looked everywhere and tightened everything..... but the obvious.
Fixing this fixed the stars!
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