Great image Paul.
Was your RGB data collected in 10min sets? 6x10 6x10 6x10 ?
Comparing against the Ha shot you took(I don;t know if you included that Ha data with this HaRGB) it looks like the detail has been washed out.
Layers with some Ken Crawford techniques might assist there in processing, and pushing that Ha detail out?
EDIT: ahh more Lum and Ha. Looking forward to reprocess