There is another thread on this forum about this. I thought I'd be getting a third grenade as well, but as has been pointed out armor perks don't stack with class perks. I'll have to try out Viking Funeral tonight as well as Angel of Death. If these don't do anything for me I'll just go back to my HoPF, although to be honest I've been playing the heck out of my Voidwalker since I landed my Obsidian Mind, aka Nova Bomb spammer jammer.