I reran the Clavius capture through AviStack overnight (10hrs processing time) with the following result:
Registax 5:
http://www.smugmug.com/gallery/11402...836_sFzxR-O-LB
AviStack:
http://www.smugmug.com/gallery/11402...515_HNG2E-O-LB
There appear to be more obvious fringe patterns around the shadow area on some of the craters in the AviStack version however detail is also clearer. The original captures were in relatively poor seeing conditions with turbulence and high altitude haze, this may be a factor.