The other build for this weapon, that don't depend of the combo :
https://overframe.gg/build/26308/paracesis/crit-attaque-speed

If you have the [Gram Prime], this build would be stronger on it, because it have better stat.

As stance, none of the 3 stances are objectively bad, it is a question of personal preferences.
And they are very different, you should test them.
Especially the combo : aiming+move forward+basic attacks

This build need something to keep the combo, like the focus Naramon Power Spike, or the aura [Swift Momentum].

[Virulent Scourge] and [Vicious Frost] not at max rank is not a mistake or to use less format :
it is to have only 45% Viral. because most of the damage come from the Slash Procs, and the viral is to increase the damage of them. But too mush Viral make less Slash proc. with this build, 48% of the proc are Slash ; if the mods were max, it would only be 32%.
(and most of the status chance are from [Weeping Wounds])

The arcane Strike is also very good to have more attack speed.
The arcane [Fury] is very good to have more damage.
With both at max rank, you increase your DPS by more than the double ; and they are very good for any melee build. If you like to play in melee, you should try to have them.