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Brave to attempt it from such a bright location.
There seems to be some vignetting. Are you using flats? You can do flats retrospectively and reprocess the image.
Even without that, your result is much better than you think: if you carefully model the non-nebulous background and subtract most of it (we had a go on a copy), you get a crisp dark (but not clipped) background and beautiful nebulosity.
Great stuff.
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