Ben,
The U.I. is a strong, early rolling ball. I have it and an impulse and I polished the U.I. heavily and the impulse lightly. The U.I. still reads the oil stronger than the impulse.
My U.I. is drilled pin above ring, cg out positive with a weighthole in the thumb quadrant. Ball has 1/2 finger and 3/8 side. In it's polished condition it gets through the heads clean until they burn out, and makes a HARD turn on the backends, even with some carrydown ( actually, I prefer a bit of carrydown with this ball.
If you want it smooth, use a drilling with the pin closer to your pap to reduce the flare and start it rolling a bit sooner, but be warned, this ball is an oiler and starts pretty early when dull. My impulse is somewhere between my U.I. and my O.I. . A bit stronger than the O.I. with a smoother read of the breakpoint, but not as strong as the U.I.
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