Let me give my thoughts on this one. I've got the following RotoGrip balls:
Silver Streak Solid drilled with the Pin just above and to the right of the Ring Finger, CG in the palm. While it does have a strong move on the backend, I find that is is a controllable ball. With my PAP, it's close to a 4x5 drilling, but more accurately I'd call it a 1:30 layout.
Silver Streak Particle samce 1:30 layout except the pin is a little lower, right next ro the ring finget, CG in the palm. This ball needs oil. Since my Sport Shot league is over, I don't have anywhere near enough oil on the "normal" house shot to use it. It gives a very strong, hard arcing reaction.
Blue Retro, pin under the ring finger, CG kicked out about 15 degrees, probably a 10:30 or 11:00 layout. This ball gives me a very noticaeble snap on the backends, very close to a hockey stick shape.
Overall, I would agree with Roger's suggestions and for the most part, my ball reaction with the Silver Streak Solid is fairly close to what he describes