Thanks for the feedback.
Mike's comments regarding the resolution is interesting. No USM or sharpening has been applied, so the image certainly has a soft/smooth look (intentional)...that said the star sizes are typically about 30% smaller than say my 6" AP.
If you look closely at a small triple star group located at 3.00 o'clock in the right dark lobe of the keyhole they are cleanly resolved and well sampled, despite the pretty average seeing I get atop a ridge-line.
True, amateur AO's do not compensate for wave front seeing. But they do correct isoplanic (tip-tilt) errors very well.
That said, once you have tracking focus etc nailed, IMHO seeing dominates image resolution much more than say, instrument aperture.
An additional H-Alpha L+R layer would no doubt give the image more "snap" (eg. smaller stars, more nebula contrast) but I'm still mulling over whether this buggers up the colour too much.... and looking out the window makes me think an H-Alpha layer won't be coming anytime soon.
Damm this Sydney weather!
