Hi, David,
It is indeed a lovely composition, and the underlying data look good.
CC: The stars and the brighter bits of nebulosity are burned out. With that scope, if you use more curve and less linear gain, you should be able to produce pinpoint stars, resolve the main cluster, and get more detail in the bright bits of nebulosity.
Another possibility is to use the Ha as a luminance channel. That would also produce pinpoint stars and improve the nebulosity, excepting you'd lose a small amount of blue. If that was an issue, you can experiment with using Ha as a partially transparent luminance channel, to strike a balance.
Hope that helps.
Best,
Mike
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