Yes, you wanan go with alot into Double Swing since it synergizes Double Throw. As for gear try a 160/60 ias using Cruel Winged harpoons of Quickness that will put you far beyond max Speed throw that way if u get slowed by necs or anything you still throw at max speed. I created a barb like this one did about 10,000 throw for each weapon. Trust me when i say he hurt.