Just learning the dual angle system. Pretty easy to lay out. Just understanding proper angles for the right people, is going to be tough. Also the sweet spot dual number. Not sure if there is a better formula, outside of trial and error.
Also in the reading I have done the last couple of days states that the angle does not matter as much as where the pin is, high or low, and the pin to PAP number to determine flare. (do not know if I am in agreement with this). As label drills do not work for me. I always need to kick the cg right (right-hander). It also states roll is determined on the weight hole more than where the cg is.
I am now a little confused. Mo Pinel's stuff seems to do that for me. I like the keep it simple method. Not just learning for me, but also for my bowlers in my center.