The way rogue daggers proc definitely needs to be changed, but proc on skill use is not the solution. Rogue skill CD is too short for that.

IMO a blanket 250 skill dmg (and whatever that equivalent stat dmg is) would do the trick. The staff too needs a 150 skill dmg boost. No complaints on the proc except that this staff seems to be slower to charge than other staffs, much like Serancha pointed out the dags were. 3 seconds to charge just isn't viable in a clash.