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Ok, I'm less convinced that this is any kind of drift / rotation. The stars appear more bloated in the top left than the bottom right, and it's the fwhm that changes the most, not the eccentricity. I'd expect rotation to cause eccentricity (elongation) issues rather than fwhm (bloat) issues.
Attached is the aberration inspector and fwhm/eccentricity plots of the best and worst (accepted) L subs I got last night on the trifid.
This has me thinking it's more likely to be something drifting around in its holder.
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