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I discovered by accident that stacking two different sessions with slightly different alignment helped. What I accidentally did was dither the two sessions. If I did multiple sessions with the same alignment, the noise just got worse.
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I think if you throw all the feedback together and pick the eyes out of it, you get a pretty good strategy combining a number of key processes, from acquisition to preprocessing. DSLRs are great providing you understand their limitations and how to manage those best. It's never just one thing? Often carrying one error forward until you have a processing nightmare.