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The distance between sensor and the coma corrector GSO 2" is 70 mm. You have plus 5 mm or minus 5 mm of tollerance. Despite of I use it with plus 10 - 13 mm: my distance is 83 mm with razonable performance. And my telescope is f/4.9
If your coma corrector is the same... check that distance.
And really it is coma. Not tracking error. The direction of drift is from periphery to the center.
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