I've managed to resolve the dark calibration issues - most likely a user problem. I also managed to grab a set of iso1600 darks at -5C during the week.
Anyway, here is a link to the new revision at Astrobin. Detail, dynamic range and colour balance seems much improved.
Waiting for the Moon to rise later in the night to get some more data - Orion has almost run its course for another year.
http://www.astrobin.com/82477/F/