Your description of the planets dancing around is probably a combination of scope currents and poor seeing, that is how it is, but the Saturn image also looks like it could be processed better to get a more impressive result.
My own efforts from some very average seeing a few nights back sound exactly like you described, it was jumping around like a cork in a washing machine, and the avi looked awful:
http://www.iceinspace.com.au/forum/a...e.php?a=111043
But it processed into this:
http://www.iceinspace.com.au/forum/a...e.php?a=111042
which is not great but far less awful than the .avi looked.
Try running the videos through Autostakkert just using the defaults and see what you get.
Or post the videos somewhere so we can have a go at processing.
The mars is overexposed by the look of it, and both images are suffering from colour balance being out when capturing.
Can you post a couple of the Saturn best frames from the .avi file, that way we can see what it should look like.