I personally experiment with the size of the orifice plug. The 2-3 overlap is one of my pet peeves. You can use tiny core plugs to drill progressively smaller openings till you get a flair up, then back up a little. Others may have a better way to get to the sweet spot, but that is what has worked for me. Usually .075-.100 gets the overlap out.

Of course, that means repeated valve body pulls. It is not "one size fits all", so the only way to get it right on any given tranny is to experiment.