one word - multidotting. That should take you to 15-20k trash dps even in 357 gear.
Boss dps should be around 15k. with that it lvl. You dont need to cap hit in hc. only on raids. (actually only on raid bosses).
First off you should reforge as much haste as possible. and gem all slots with intellect (except where you can get intellect bonusses on gear - then orange/purple is ok.)
Your opener is wrong though. You should start like this: VT-dp-sw
and then mf untill you get an orb. Then instantly MB to get Empowered Shadows. This you KEEP up all through the fight.
And dont use you arch until you have emp shadows and make sure its stacked to 5 before releasing it.
That should take you in the right direction.