I have the same problem as OP, my dps is really low as combat. Pulling 16-17k at Butcher HC with an ilvl at 640, which is really bad tbh. Started as Sub when I first dinged lvl 100, so my stats aren't really suited for Combat atm, but keep getting better items as the days go by. I'm using VR and MfD, don't know if I should switch to Anti instead of MfD?