Hi David,
I'm no expert by any means, and have only picked up a lot of good tips from the experts on this site.
Just looking at your image i feel that the light pollution was a real draw for the image, and also you probably need to take at least the same amount of darks as you do your images.
Also a 2'' T adapter would certainly help with the vignetting, other than that the guiding looks fine.
I think the Moon probably let you down with this one, maybe a light reduction filter may help as well, but i'm far from an expert.
Cheers leon
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