Bit late to the party, but sheesh... that's a great image! I wouldn't change a thing if it were mine...
If you haven't done so though, definitely check out StarTools 1.6, as it comes loaded with new dedicated narrowband functionality, enhancements and presets, building on the Compose module/mode introduced in 1.5. If you're not familiar with
that - it processes chrominance (colour) and luminance (detail) separately, yet simultaneously (not in sequence as necessary in PS/PI!), to the benefit of signal fidelity and workflow. In terms of workflow, processing complex narrowband composites is now almost as easy as processing data from a DSLR or OSC.
In 1.6, once you hit the Color module, you can now choose from a huge list of popular narrowband blends and renditions with a single click ("Matrix" parameter). The golden yellows, oranges, etc. should all be there. E.g. no need to manually re-composite or re-weight channels if you changed your mind on the blend - it's all done for you by the engine on the fly. No "illegal" independent non-linear channel stretching (causing local misrepresentation of emission prevalence) is used either. And if you really, really hate green in your narrowband images, there is a dedicated green suppression slider now.
And, lastly, if you haven't done so also check out the Entropy module, which was designed for intuitive narrow band detail manipulation (also works well for Ha in the visual spectrum).
New in-app help should have you covered, but any trouble, questions (about NB processing or otherwise), do feel free to send me a PM or email. Clear skies!