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The QSI sensor (KAF683) micro 4/3rds size is less than half the size of the ASI6200 -full frame 36 x 24.
So you the centre stars are always sharper than the outer stars. Star sizes get larger the further out from the centre you go.
Its not a focusing issue its a tilt/flex issue.
By the way Rodney the 178mm is the backfocus. FSQ is a flat field scope meaning there is no optimum spacing for the imaging components so long as its less than 178mm.
Looking at the Rosette ASI image in CCD Inspector it says 11% tilt and 54% curvature which is very high. Not sure why its saying that.
But fix the tilt first. Coma would be all 4 corners not just 2.
Greg.
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