Arrow pass clearance and cutouts, a little to a lot, ONLY change which arrows shoot best out of your bow. They do NOT improve consistency unless you are shooting mixed spined arrows.
I never make the arrow pass narrower than the handle. It has never created an issue. I find out which arrows shoot well out of the bow and that's what I shoot.
With this takedown, the arrow passes on the metal above the leather, so I guess the pass is narrower by the thickness of the leather, but it's 1-1/8" wide there.