Everyone knows Knife in NM is Stronger than before, But dealing with bruiser and bosses still is problematic.
Plus the teammates don't give a Eff thorwing nades while you're knifing the muatoins, so why not just do the same thing everyone's doing.
Choose Numb instead of True grit because we don't get too close to tanky mutations (Except when there's a doorway then you could just knife throught the wall to kill them)
Do be wise using your stamina until u get Berserker, stack 4 to 5 then you no longer need to worry the knife exhausting.