Close Range DPS? Galhran Solo Duality

Trying to solo lvl 300 Duality. I've been using a prismatic warlock build which is extremely tanky. Problem is I've been having problem with DPS during the damage phases. Normally I'd run 1K voices w/ the catalyst but because the guy jumps around so much its a bit of higher risk. I've seen a shotgun build that seemed decent but wondering what others have run soloing duality.