In case you missed it.
To further clarify, damage of those effects are calculated based on the max damage of your weapon.
In the screenshot I posted, the polearm’s damage range is 530-794 and Andariel’s Visage effect is 4000% weapon damage or 40x.
794 x 40 = 31760
If you use two 1.10 speed one handers or a bow, the max damage is 650 and Andariel’s Visage does 650 x 40 = 26000
damage