I did a repro on this with some proper noise reduction masks and boosted the colour. Not sure if I've actually overdone the colour now.
I also worked on the star shapes a bit as best I could. They weren't uniform across the field so I think I had some tilt in the system. Not sure what to do about that other than buy a new 2" nose-piece (the old one is pretty rough and ready and really needs replacing anyway).
Oh I also got rid of the excess green
Original Astrobin link in the first post has the repro uploaded in higher-res.