I hope you don't mind Allan but I did a bit of work to the image. I don't normally repro other peoples work, but thought this would be instructive for you (not that I am any expert). I think this version looks a little better and less flat. I will explain and just show you what I did.
First I did a shadows and highlights around 33%. Then I did a curves adjustment with the medium setting which I boosted on the right hand side. Small amounts are only needed here, large boosts tend to over burden the image.
Then I did a mask and a colour saturation to the stars but did not include the nabula. I used a gaussian blue of aroun 4 pixels on the boundary. The reason I did this is the stars are not fully saturated and I thought need a greater saturation.
After this I did a little smoothing via a double mask with only just a slight amount of guassian to each side of the mask.
It goes to show how much data you did get, but I still think longer subs would have helped.
Edit. it is still a little blue but some adjustment in the blue channel will make this look more natural.
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