Evolutions:
~Swift Deliverance: We already get -95% recoil from the Deadhead and [Stabilizer] combination
~[Retribution]'s Vessel: Nothing else is useful
~Elemental Excess + Devouring Attrition: This is how [Phenmor] produces such high DPS
[Speed Trigger] is a flex slot. If you're willing to Forma again, it can be literally whatever you want.
Riven:
~If you don't have a Riven, use Infected Clip.
~If you have a Riven, but it doesn't have Toxin, use Infected clip and de-rank one of the elemental mods to fit [Vile Acceleration].