Ha, I spent a couple hours trying to hit 100% health damage on Kindred passive. Only got to like 98ish% before minions won for me though.
You do know that you need closer to 140% in order to one-shot people with it, right?
Base damage on the Auto though. At that point I was doing about 90-95% of their health.
I've spend so much time in custom games practicing Barrel combos :v