When leaving 10 pins, I move my target a few feet toward the foul line, when leaving a 4 pin, I move my target a few feet toward the pins.
It's the same thing as what everyone else is doing, making slight breakpoint adjustments to get the ball to hit the pocket at the proper spot and angle to carry. The reason it sometimes doesn't work is that we also change something else, like ball speed, or we don't throw the ball where we intended to.
That's why I'm sitting here typing this crap, rather than bowling in the ToC.
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seadrive
Cogito ergo bowl