I think the Proton PPA and the NC variant of the AI weapon (was it Enforcer Modified?) should be a bit buffed to compensate for the Marauder which is now basically a better and cheaper Fury.
I'll only propose a buff for the PPA since I never used the NC variant: increasing projectile velocity. This way it would keep the traits of a Vanu weapon without it crossing over into NC (more damage) or TR (higher ROF) territory.
I'll leave it to NC players to propose an Enforcer Modified buff since I've never actually seen it in combat