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Hey Roger,
First off, let me say that the galaxy detail looks pretty good.
There does seem to be an optical issue at play given that you have different star shapes at different places in the image. Could be collimation; I have zero knowledge of that scope though.
I note the background is black clipped; I think this could be the cause of the posterization you refer to. I also note the stars look a bit bloated and also clipped... that could be capture related, but I'm suspecting processing. You may need to work on boosting the signal and increasing contrast without relying so much on black point / white point adjustments, but that's just a guess (i.e. think curves transformations and mid-tone adjustments on histogram transformation rather than the black/white points)
Hope that's of some help.
Cheers,
Lee
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