I don't have a problem with dominating as Behemoth at all. You're not supposed to be a one-man army, you're supposed to draw players in, surprise them, drive them away from each other. I think the swing speed of the crowbar could be increased a bit (so getting near a Behemoth is even less recommended) but that's about it. I know this sounds stupid, but have you played since the armorbug got fixed? The thing that made the Behemoth scary as balls was the uncertainty if the meatrocket was going to armor bug you.