Sorry, I main a titan and I have all classes. However, Hunters really get no love when it comes to exotics. Besides, reducing speed and health is the balance factor for increased defense since Hunters lack that. Element means nothing in PvP, over penetrate is useful but very very situational, and throw speed would be wicked fun to match against. Maybe stacking it would be overkill, reducing it to 1 knife throw with a longer cooldown might justify your concern since in PvP it might just 1 hit snipe someone. There's always room for improvement. It's just a fun idea. Cheers!