Jase...clearly a great image. But to be frank, (you can take it

) not as good as I would have expected from a 24” RC in pristine skies with a back illuminated CCD. (hey.. I image from crap skies with a similar, albeit smaller...50% smaller... back illuminated rig, so feel just a little qualified to comment thusly....)
I suspect the decision to bin the data 2x2 for extra signal gain, while still giving good sampling also did not allow significant oversampling: with a view to heavier de-convolution...i.e. an image with a little more “snap”
But I have to ask..why narrow band? RGB gives such cool colours within the Helix. A personal choice to be sure, but unless you want to make a science statement, natural beauty sometimes suffices.
None the less... the result is clearly in the imaging stratosphere. Your image processing is excellent.