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Looking at that image isn't easy to see what is actually happening, its too far zoomed out so to speak.
From the CCDIS image it
A. Looks like you have a decent amount of tilt on the imaging plane
B. Coma in the corners is struggling.
So look at
A. the seating of the MPCC in your focuser. If you are using the standard focuser, it is probably not really upto holding the load for AP accurately.
B. the Baader MPCC isn't really made for a F4 type of correction in saying that it will kind of work but just not perfectly so work with the spacing you may need to increase the spacing from the sensor you may find a middle ground of under over and properly corrected image plane.
C. Look at a wynne corrector...
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