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Nice stuff, Rod. Good start.
Can't you use Backyard EOS to focus? It's what I do - the FWHM tool is great. As you say, a loop of 5s jpgs at ISO 6400 will give you a good base. Pick a smallish star at those settings, whack the Backyard EOS zoom box on it, and adjust the focus till the FWHM is as small as possible.
Still, looks like you got focus pretty well however you did it :-)
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