Brigitte Balance Idea

Hello. My idea to balance brig is to have her shield bash stun targets with less health than her and only do a slight knockback to targets with more health than her. That allows her to peel for other supports vs dive dps while preventing her from outright initiating vs a frontline like reinhardt unless theyve already been damaged.
This would also add an element of skill to the hero, as health management with inspire becomes more important to land a successful stun, and rally helps guarantee a stun vs 200 hp targets or slightly damaged tanks.
Thoughts?