Bowling coach Joe Slowinski has something called the "Quiet Eye" system that I've found works really well to help visualize the ball path and also keep a steady eye on your final target (which for me, is usually the arrows).
I may have modified his approach somewhat, but it's basically to look in one spot for two seconds (around the 6-pin if right handed with a final target of around the second arrow), then another spot for two seconds (I choose a mark halfway between the 6-pin and the second arrows -- which typically works out to my breakpoint) and then my primary target for two seconds (the second arrow, in most cases).
As you move your target at the arrows, you'll also move the other two targets. For instance, if you're playing third arrow, your first target might be the outer two-thirds of the 3-pin. This article ran in Bowling This Month magazine and is nothing short of a breakthrough for me.
I don't know how he came up with the 6-pin -- most people probably look at the pocket, then their arrow target -- but it works. What it does for me is program my brain not to cut off my swing too short and pull the ball. Since I've gone to "Quiet Eye" targeting, my average has increased about a pin per week for 5-6 weeks and I'm now projecting the ball better to the breakpoint. I pull the ball a lot less.
It also makes it easy to pick a breakpoint closer to me -- I just don't look at the 6-pin. I move my first target back to the breakpoint, my second target closer to the arrows, and then the arrows. If I want it to hook even sooner still, I just start at the arrows and finish with a closer target than that.
Simple, simple system -- and it works.
Jess
