The 718A will definitely be stronger than the 607A. I think it would fit that spot that you need. Go pin up and you will really get the strengths out of the ball. Something around 5 inches from your axis. It will deliver great length and continuation through the pins.
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i would look at the 916AT ---- i have mine drilled similar to the #1 layout, but instead of pin up, i went pin down. i get plenty of length with it and its very strong off the spot. i kept it oob, but you can shine yours up if you want more length. thats why i like this ball, you really get 2 balls in 1. i have not thrown a 718A yet, so i don't know what it will do, but you will love the 916AT!