Scott,
I don't have experience using a double thumb layout on a NBPP, however, I do have one on a Kinetic Energy. Mine is drilled pin 5-1/8" from axis, above ring finger, with the MB 3-3/4 from axis, and the weight hole is right next to the MB. Current finish is 4000 Abralon.
I believe the NBPP does have a dynamic enough core for this layout to help you. The KE has an RG of 2.48, differential of 0.040, and an intermediate differential of 0.006. By comparison, the NBPP has an RG of 2.56 and a differential of 0.052.
With my layout, I see an excellent midlane read, a defined movement on the backend, and continuation through the pin deck. The KE reads the midlane excellent, and I think the NBPP will do the same with the low load particle in the coverstock. Last night in league I was able to use it for all 3 games with only a couple board adjustment left throught the night. The backends got tighter in game 2 and 3 last night, but I was able to continue using the KE and still kick out the 10 pin.
Sorry for mentioning a Track ball in the Visionary forum, but I hope my experience with the layout will help. If you have any other questions about the layout, drop me a PM.
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Hook 'em Horns!
"Stats are for losers, I like winning games." - Will Muschamp, Texas Defensive Coordinator