Buff the exotic perk.
One way or another: Precision kills increase agility and armor by 1. Increases damage by 6.67%.
Lasts 10 seconds and stacks up to 3 times.
Inb4 someone says it is good enough as it is.
Edit: lol
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Or just make the perk trigger either way on a Crit Kill for Agility or Body Shot Death for Armor. Why the hell is it one or the other and not both? Half and half perks like this IMO do not deserve to be on an exotic. Moreso on Legendaries really.