Thanks Tom so much for your input.
I'm amazed you think the AVI can use all frames. I was culling it
down to 250-300 frames!
I tried a few Drizzle and resample attempts too..none seem to
better my original effort, and none come close to yours!
With the 12" mirror I can get away with up to 1/250 sec exposures but the
gain is cranked right up...very noisy in stacks.
One thing I haven't tried is combining 3 x AVIs of 1000 frames each in VDub
which were all 1/33 sec / gain 75/100 and spaced no more than 3 mins apart.
Steve