ONLY thing I can think of Mo.....is IF he's considering "identical" to mean vanes v. feathers (and not total arrow weight)......the lighter arrow is gonna go faster. Period. SO its not gonna slow down, faster. The heavier arrow would.

Now one "could" throw "drag" into that mix and they may be able to argue (as you're doing....well....not "arguing") that would offset the weight issue.

I just don't know, though.