Amon shouldn't be slowed by Heavy Ordnance!
Or at the very least the movement penalties should be reduced. He's one of the most jacked Vault Hunters to date, the size of an ogre and his left arm/torso is replaced by cybernetics to enhance his strength further.
It wouldn't make him overpowered or anything, it would just make his Ordnance build a lot less of a pain to play in the open world/mobbing content since it relies on 100% upkeep of your big gun and infinite ammo. You're constantly lugging that thing around.