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You may not wish to Brett, but one option is to put the master FITS data up somewhere for people to try and work on.
Can be really frustrating when you've spent lots of time and don't feel your getting a decent image. My 2cents on workflow I'd attempt initially:
Create synthetic lum
Balance RGB and flatten/colour balance/stretch as possible
See if lum has enough data to survive deconv or other contrast enhancement/tightening. Probably need masking of stars and neb which is half the battle. Possibly add some Ha to Lum.
Consider adding 50% Ha to R
15% Ha to B
Attempt new RGB with modified R and B.
LRGB combine
Final color, saturation, contrast tweaks.
From what you've said, my generic approach for brighter nebs/galaxies may not be best for a faint dark neb. May even require separate star and neb processing.
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