A nice image Mike, and I hasten to add that the colour works well for me
The overall level of sharpening appears quite pleasing to my eye as well. I guess the perfect amount of sharpening would be that which compensates for the noise in the total system (incl. atmospherics / optical / read / shot / etc); no more, no less
I'm not sure about flats introducing noise though; assuming that a reasonable number of flats are combined I would think that noise may be reduced, due to the slight variations in sensitivity between pixels. In other words, the noise introduced by the flat would be overwhelmed by the variation in pixel sensitivity (given also that there is high SNR for flat frames). I'd be interested in others opinions here
Edit: Actually, upon looking at some flat subs my initial impressions appear incorrect, the variation in pixel value does not appear to be consistent even for high signal so is probably attributable to noise rather than pixel sensitivity after all ...