Two things.
I switched to a multi focus system, I look at a spot at the end of the lane where I want the breakpoint to be, and then look back to the arrows where I sight. Its definitely helped my accuracy, and I would recommend trying that.
Second, dont focus too hard. I noticed that if I concentrate solely on hitting that point, Ill either pull the ball to the left, or ill mess up something else on my release. Just "see" the target, dont "look" at it, if that makes any sense.