Whenever you leave a 7 pin, you've hit the headpin either high, or light.
You should never rely of the 5 pin to take out the 7 pin, the 5 pin's job is to take out the 8 pin.
So ask yourself, do you need a different ball to hit the headpin in a different location?
As for a 10 pin, that's a balancing act, as your ball gets stronger to take out the 10 pin, you're increasing your chances of leaving a 9 pin.
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