I suggest using
5 Violet Archon Shards with more melee critical damage (this will hugely improve your 4)
MODS:
[Savage Silence] for the finisher damage, Valkyrs spin attack DOES fall into that category when the enemies are blinded by Silence for 2 seconds.
[Equilibrium] for energy sustain, this could be swapped for [Streamline] if desired.
WEAPONS:
For use with my [Valkyr Talons] Prime build BEST BUILD Valkyr Prime Talons
I like to use my Kuva Nukor Primer and my Ohma God Just build Corrossive instead of Viral on [Nukor] and Viral + Electricity on the [Ohma]
You should also use a melee with ALL the Gladiator mods, since this WILL affect the exalted. I like the [Praedos] for the IV evolution with parkour velocity.
ARCANES:
Dexterity arcane on both primary and secondary weapons.
Arcane Avenger will proc even while under the invincibility effect of Hysteria
FOCUS SCHOOL:
Madurai focus school for ability strength after operator ability cast.
Enjoy!