>>528940772
Because you're skipping ammo aura for a bunch of meme nodes you don't actually need. Also kraks are retarded, you have bolter for all the things those do. They're good in havoc but I know this isn't a havoc build by virtue of not having ammo aura.

Try picrel instead.
Surgical head popping. 2 crit headshots kill a crusher, 1 crit headshot virtually everything else.
Can run marksman's focus instead if you hate tagging.