Hi Mark, You have captured quite a bit of the detail in this nebula but as TJ states it is a bit hard to fiddle with such a small JPG image without increasing the likes of the JPG artifacts etc.
I have had a bit of a fiddle and with some small tweaks on levels and curves and some adjustment to the red curve This is what popped up. Lots more could be done but the original stacked image would be needed. Try to keep away from unsharp masks and detail sharpening at the moment and see what you end up with. Sharpening can seem to increase the noise level considerably so just keep at the standard items such as Levels, Curves, Highlights and Shadows, brightness and contrast and maybe a very light gausian Blur and see what you end up with. Also have a fiddle with the separate colours in Levels and curves you can always step back if you screw up.
Good luck.
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