DW is definitely lagging behind 2H in terms of damage, which has forced all stamina DPS to using it if they want to be able to pull effective DPS in group instances. These are my suggestions for bringing DW up to the level of 2H so stamina DPS has more options to be effective.
Rapid Strikes:(Morph of Flurry) Reduce it's channel time from 1.3 seconds to 1 second. This should make it's DPS more competitive with Wrecking Blow.
Shrouded Daggers (the morph of Hidden Dagger that no one takes, because DW doesn't need another AOE attack): Completely rework it, (change the name to maybe Lethal Dagger) making it remain a single target ability with a 7 meter range, and keep it's damage about the same as Hidden Dagger. However, give it a 300% damage bonus to targets below 25% HP, making it an execute ability. This is very important, because as it stands even stamina DPS that refuse to use WB still have to use 2H just for Executioner (except NB of course), because it is the only Physical Damage stamina execute that anyone has if they aren't a NB.
My last suggestion is not nearly as necessary as I feel the other two are. If the above changes were made, I think it would be enough to bring DW's DPS up to par with 2H. However, 2H will still pull slightly ahead due to the Empower buff. That is why I suggest:
Rending Slashes: Increase the damage of the Lacerations DOT by 5%.