Colin, nice image. If you reduce the opacity of the luminance layer the colours should pop better. That works for me (well in Photoshop), but I don't know how your processing it. I usually limit luminance opacity to 17-20% depending on the object. I have found that Ha can work well for as luminance on some objects, it tend to give you shaper stars, at least on my TS refractors. How are you shooting luminance with a OSC?
I am usually shooting mono through filters, so that also gives you the ability to boost colour saturation on the individual layers, which can also improve overall colour coming through. You should be able to play around with your OSC saturation, worth a try. Still whether 47 Tuc or Omega C, there is not a lot of native color there anyway.
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