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Hey Paul,
I'm hesitant to point this out since you're having success and generally speaking it's best not to fix what isn't broken, but the star profile there looks a bit squared off at the top, which suggests to me that your longer exposure actually clipped that star which would have some impact on centroid calculations and thus guiding... not exactly sure how that would manifest in terms of corrections and/or reported RMS, but someone else more knowledgable than I am should be able to chime in there...
Cheers,
Lee
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