Mine is similar with the CG about halfway between the pin and the rg, it's offline about 2-1/2". Mine is setup 4-1/2 x 5"rg, with the cg being about 1" left of the center of grip. The middle finger was drilled deeper, and there is a bit of negative side weight on the ball. It doesn't seem to affect the roll though, still a very strong ball with a strong move and good continuation.
You have to remember that CG and side weight doesn't matter much on these strong MB balls. You could probably get close to 5x3 and still stay legal.
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-Clint