When I did my build I had the same issue where the opening was too narrow. You need slightly more width on the bass side for the wider string - otherwise your fretting finger will push it off the neck edge, if it's offset too much on the treble side file and block sand the bass side of the pocket. Don't sand the pocket floor though.
With this amount of offset this guitar plays good with great action. You see how there's just a touch more width around the low E
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