Shadow daggers is a cool mechanic to build around. I get that it was way overperforming before the bug fix but now it feels a bit clunky to play with. I have some sugestions for this.
1: Make it only require 2 stacks but half the damage it does.
2: Add an Affix or Idol that has X% chance to apply a stack of Shadow Daggers. (Basicly if you have a skill with 100% from a skill +300% from affixes you would get 4 stacks per attack. This could be op so maybe cap max %chance to a total of 200-250% with the skill included)
3: Add shadow Daggers to more skills, Shuriken would be awesome.
4: Make a Unique or set that makes your attacks add extra daggers to your attacks or shadows. i.e. “Your shadows now create an extra shadow dagger with Shadow Cascade. (if they cant already create shadowdaggers they now create one.”
You could just nerf the damage to keep the overall DPS at the same level as it is now but the feel of the mechanic would be alot better if it did not require 4 seperate hits with attacks to make it go off.