looking at your pic it looks like your cg is in line with the pin.
but like they said have them weigh it and what not. my roto grip
RSX had a 5 1/4" pin, and i had it drilled to go long and strong
arc in the back. and it does exactly that. i received that ball
from bowlingball.com. havent dealt with their customer service, but
keith spear is a pretty stand up guy, known him for years. it doesnt
hurt also to email them about the miscommunication of the sell. they
may swap it for ya.