stock turbo + MBC = boost taper theory

[Kracka]

I have a theory I've been working on lately, and I'm wondering if a larger bleed hole in a MBC would lead to less boost taper in the higher RPM's. Obviously the taper is good for some of us on pump gas, but for the E85 guys or the guys running larger stockframe turbos on pump the extra boost up top may be beneficial.

Taken from a tech article by Perrin regarding their MBC:
"One key thing to our MBC (Manual Boost Controller) is our bleed hole. In the stem is a bleed hole that serves 2 purposes. One is to relieve pressure from behind the ball when the turbo is not making boost. If this wasn't there the wastegate would be stuck open after the first time it made boost. The second purpose is to bleed some of the volume of air flowing through the MBC. This helps with keeping a steady boost curve that doesn't drop off severely at higher RPM."

What would the drawbacks be for a bleed hole that's too large? More lag? Less precision? Has anyone tried enlarging their bleed hole?