Personally, I think I'd like BRV to work as follows:
Battlerage Vigor:
Once per round when you make an attack, you may treat that attack as Invigorating. If you're already attacking with an Invigorating power, you gain double the normal temporary hit points on a hit.
If you have temp hp, you deal +1 damage with all melee attacks. If you're wearing chainmail or lighter armor, this bonus increases to +2.
Clean, simple, and solid....I like.