Dont use armor mods or [Guardian] as they add such little damage reduction to the already 6000+ armor you have from vex. And no damage mods or arcanes on his weapons either for the same reason(Imagine you have a serration-hornet strike-point blank-pressure point between 700-900%{this would be like Condition Overload and having 6-9 status on every enemy at all times}). Fill those slots in with faction mods(Bane of grineer, Expel of Corpus, Smite infested, etc.) or Fire rate/attack speed mods.
There are many arcane options you can chose from, this is just what I have on. For example you could use molt augmented and have overextended+streamline instead of the two range mods.
Shared Polarities across all builds