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the RGB looks OK to me. you do not need much colour info where the image is nearly black and you have nice colour in the brighter bits. I would give an LRGB a try with what you have. If it comes out too noisy, maybe ACDNR like others have suggested and then do a DBE, probably best with a subtract of the background. You could do those two operations on either the RGB image or the final LRGB image (deselect luminance and select only colour in ACDNR). The luminance image seems to have some structure remaining in the background, so, if you do not apply DBE to the LRGB image, it would probably be a good idea to use it on the luminance anyway, to flatten that out a bit.
It looks like it will be a really good image of a difficult object.
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