Where are you bunnies Ken? On the chip or in the scope?
Trying to do separate avi and rotating the camera will cause a few issues even though it should take care of the bunnies, namely the features on the sun may have morphed to much between avi runs to be able to get a good clear result. What you might want to do is to dither your avi. Move your mount about the diameter of the largest bunny in RA and then in Dec a number of times over the Avi imaging run. Just make sure that you let it settle for a few seconds between dithering movements. Then split the Avi into bmps and when you combine the bitmaps see if you are able to use a median combine (not sure if Registax will let you use a median combine but you could using IP and possibly K3). Theoretically this should take care of your bunnies and possibly even help with the vignetting as well.
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