A nice picture that needs new processing in my humble opinion.
The stars look damaged but I realise that you had coma issues.
I would have removed the stars as per:
http://www.astro-photography.net/Star-Removal.html
(note delete doesn't work - just use fill & content aware.)
then processed the nebula -
later I'd put the stars back from a not so stretched previous version.
That would keep them smaller & tighter without tails.
cheers
Allan