[Kameron8]

Can Bullet Barrier deflect two bullets per Rank, then?

Rank 1: 2 bullets
Rank 2: 4 bullets
Rank 3: 6 bullets

What you're suggesting doesn't just 'make the skill work against quickdraw', it also tweaks the power level of the skill against multihit weapons that aren't quickdraw to stupid levels. Things like Ryesers, Yin, and Yang are physically incapable of shooting over six bullets a turn without immediately turning to Extended Grip + Akimbo.

There's no issue with the power level of Desperado, and just classifying it to not work with Blade Barrier keeps it that way. If it really bothers you that Quickdraw will deal chip damage to you through Bullet Barrier, try to beat them out on initiative so they get fewer shots.