I have view this image at least 6 times and went to comment several times but decided to hold off. Until now.
First, this is very smooth.
30 minute subs is the most you really need. You can use 20 minutes and that will still overwhelm the background noise given enough subs and some smoothing tricks.
The image really needs some Ha to give a depth of field. The image currently looks a little flat and we know it is a three dimensional object so that would be the goal here. Some masking with curves of different types will help to lift the image and give it a depth of field.
I don't care about the diffraction spikes. Either way is fine by me.
I think it would be better to show the entire field you have captured here too. It might be more effective.
Finally, crank up that saturation. It will help to make this a dynamic image.
Good data, great image looming in it. Looking forward to a repro down the track.