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Seems there are a few things going on in there. First I think you're slightly out of focus in your cluster shot. That would make coma and other aberrations worse in your field. I think you have coma and also astigmatism. The latter could be confirmed by comparing in and out of focus shots. Maybe pinched optics as well.
Here's what I'd do to eliminate possible causes.
1_ check the primary and secondary glass are not stressed (primary retaining clips and secondary bonding)
2_ check your on axis stars in and out of focus. If you have astigmatism rotate your primary until "it's better".
3_ once your on axis stars are sorted check your secondary position/tilt and collimation without corrector.
4_ tweak your coma corrector spacing to get the flatest field you can.
See how that goes.
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