Gordan some nice detail in the core of M83
Stars are odd shaped just like my schmidt Newtonian though i don't yet own an MPCC your stars should be looking better than that as Clive mentioned could be Focuser sag or something to do with where your MPCC is placed.
I see what looks like Vignetting in the Right bottom side also. Have you done any flats? you could try tidying up with some kind of gradient tool like the one used in startools.
Im still learning things myself but seems we have similar problems.
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