So far I've only been able to use this ball on my Tuesday night league, that seems to be where there is the most oil out of all the houses that I bowl in lately. Tonight I was determined to throw a better ball, as I've shot 590 and 569 with it so far the previous two weeks in league. After determining that my ball speed was a little too high for this shot (they triple oil the heads to 15 feet, then buff it twice out to 38 feet, seems to be a heavier concentration outside of 8, a little lighter inside of 9...), I made sure to start the ball a lot lower in my stance (a little below the waist). I played 17-12 most of the night at a slower ball speed. I shot 235 with 8 strikes (2 silly missed spares that game), 193 (with a washout in the middle of the game) and a 170 (had to move to a new pair due to a 15 minute lane breakdown) for a 598 series. This was second high in the league that night (my friend shot 625 with his Primal Instinct, going straight down 5 board). Since I am the only lefty in the league, I felt my shot held up well and the Rule definitely helped my carry- higher shots snuck the 6 pin out, light shots carried well, I think I left two 7 pins the whole night, 1 10 pin, no 8 or 9 pins...
Brought my average up to 184 in that league, slowly but surely climbing. Thanks to everyone who recommended this ball, it keeps getting better and better...
Matt