For those that throw full-rollers, which pin and top weight setup works best for you and how did you drill it?  My dad throws full-roller and has both a Mutant and Deuce that die after 20 feet no matter what we do to them.  No matter if we polish them or dull them, they just won't move.  

I'm leaning towards both the Visionary Charcoal Executioner and the Granite Gargoyle for him since they have lower grit than the two he has now, maybe a Centaur and a Big Blue Pearl.

Any help would be greatly appreciated.
Thanks!