If you run a passive Primer such as [Diriga], consider swapping Primed Cyro Rounds for [Galvanized Aptitude] and Primary Merciless for Rank 5 Primary Blight.

For Fragmented One boss, swap [Primed Cryo Rounds] for Galv Aptitude and use Primary Blight, and consider running [Diriga] or use a primer.

EVOLUTION GUIDE

Evolution II: Final Fusillade gives +51 damage. The last shot bonus doesn't apply to incarnon mode. The other option Plentiful Mayhem only gives +31 dmg and consumes all your ammo rapidly.
Evolution III: Pick any, but i prefer Swift Deliverance +50% projectile velocity to allow you to hit targets easier for charging of the incarnon form
Evolution IV: Commodore's Fortune - increases CC to 49%, so final CC is 147% with Crit Delay.