It’s rather impossible to build around RG’s vire’s might because of the weird conversion on the set.
With this change, pot3 will be able to convert volcanic stride’s fire damage to acid damage.
https://www.grimtools.com/calc/p25JnDyV
These are the only items which might benefit vit VM. But the fire conversion on the weapon, and the conversion on PoT3 renders the bonus damage on 4 set bonus worthless.
You also cant try ditching vit in favor of acid because of the modifier on the amulet.