I personally never got spare "systems". At least not for people who throw the ball straight at spares.
If you throw it straight, then just throw it straight. Of course you would shot across the lane at the corner pins to give yourself more lane surface to hit the pin, but still, throw it straight at the pin.
One thing that has always bothered me are people who claim they can't throw the ball straight. With exceptions to anyone with an actual physical limitation, some young guys I bowl with can't seem to take any hand out of the ball or just simply come up the back of it. Sorry for the rant, its just annoying.
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I have BIG BLACK BALLS!!!!
And they are both made by Hammer!