I drilled my primo  5 7/8 inches from my pap with a slight cg kick to right.i was trying to get a ball to finish strong as the lanes start to burn.It worked very well i still use the old hd slant and guru mighty but when these start to move early my primo stops the movement and still finishes extremely strong.I also found out that on shorter oil patterns with good backends this ball controls the back so you don't have an over under.After falling in 2 weeks as a sub out my way I've averaged 246 with it .Very clean break toward that pocket.great ball and very versatile .This ball is a must have for all levels of play