I can't answer your question directly, but I can give you a reson why I hunt with longer vanes - for what it's worth...

I only hunt (no need for fancy gizmos or therories or lightening speeds).

I find that the repeatability and convenience of a wisker bisquit (fancy gizmo that works!) is respectable out to 30 yards, which happens to be the longest shot I care to take at an animal. I like the longer vanes (5") as the vanes sit inside the wiskers just enough not to rattle around. I shoot a bow at 230fps (arguably laughable in todays standars) but my "tag rack" continues to grow with this SLOW BOW and LONG VANES