Good work Dunk. Maybe stop down the lens a bit and reduce the exposure even a little more and take more subs - should clean it up. I think you're definitely on the right track.
I make adjustments in DSS too then post-process in PhotoShop. If you don't want to pay for PS (which is expensive) then two free image processing tools are ImageJ and GIMP. If you care to splash $60 on dedicated astronomy image processing software then Startools is an option too. Everything else I'm aware of is fairly pricey.
Cheers,
Cam
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