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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Just change the perk around because it makes no sense, why get a greater reward for body rather than precision? 1 perk: Precision kill gives Armor and Agility boost, Body kill gives Stability boost (to increase chance of Precision kill). And reduce the recoil a tad-bit.