These look pretty good Paul.
To check flexure though, just take some images of the same at 10 and then 15 minutes. Each will show more star elongation if you have flexure present. 5 minute subs are pretty hard to see if flexure has been eliminated. In the last year I have been imaging with 15 minute and 20 minute subs. Once you get your flexure sorted you should be able to do the same.
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