I'd probably be more concerned about why the focus was so far out?
I find manually focusing by watching FWHM numbers to be rather tricky, since it fluctuates so much even in good seeing. I like using a Bahtinov mask in combination with the Bahtinov Grabber program. It provides real-time feedback for how far out-of-focus you are, and whether you're in the critical focus zone for your optical configuration.