yeah, I think DS has a hard time making best use of lucky hits although the base chance of the skill is pretty solid.
The most successful lucky hit build I know is Chain Lightning with Heir of Perdition, Fists of Fate and Azurewrath as main damage.
I think Azurewrath has around the same damage as Ugly Bastard helmet, but I haven’t found a single one with GA on lucky hit this season ^^.