Had a bit of fun trying some difference ways of processing, lost count on the number of times I started back from scratch again haha To try something different I even ended up blending a version from PI with one that I ran a Low Pass FFT on in MaxIM DL, seemed to help a bit.
I have not done any HDR on this version, I tried but for some reason there were some regions where the blue stars behind the nebula would poke through and create some really funky results. Without the HDR it does give it more of a 3D feel, not quite as flat, the nebula actually appears to be in front of the background stars.
No doubt end up having another go at this at some point.
Full Res