Chris,
Stacking an AVI usually give a better result than a single frame because you increase the signal to noise ratio of the image. The wavelets function can also do an amazing job of bringing out details in what seems like a fuzzy image.
Registax takes a bit of getting used to but even the automatic processing option does a pretty good job. I haven't found any good instructions for how to use wavelets but usually just experiment to find a combination that works adjusting one at a time. When I find a good combination I save the setting and apply this as a starting point next time.
Iceman has posted a good article on planetry image processing that involves extra steps and you will need Astraimage or something similar to do the RGB combine but you can see how he applies Registax to the monochrome images in the article. I think this link will work..
http://www.iceinspace.com.au/index.p...63,306,0,0,1,0
Peter