They should get the 20% increase from fast metabolism, but not from cardiac arrest since it's a owb perk and you can't reference stuff cross-dlc.
Aw, that would've been an effective combination. Not sure if Fast Metabolism is even worth taking now. Im on my EW character right now and Im trying to decide what this last perk should be. Cant think of anything except Nerd Rage
besides this. And yea, Im getting either Just Lucky Im Alive or Thought You Died also.
Edit: Oh ok, I didnt see your edit. I hope you're right.