There is a pretty serious difference between the 2 balls. The 2fast is a low-mid performance, and the VG has a lot more potential.
First off - did you already get the ball fitted, or fixed to fit you? I guess there is a slight (and I do mean slight) possibility that you and your friend have the same exact fit, but I would still have it checked by a pro-shop just to make sure. Even if it's just a size off on the thumb, it could mean all the difference in the world, and it's only like 10-15$ to fix.
Second - I assume this is the original VG that storm released a few years ago? If so, while you're at the pro-shop, you may want to have it bled out, so that the ball is as close to NIB condition as possible. This will give you the reaction that it's intended for.
Last - with the above being said, granted everyone's game/release/etc is different - but check this link out. It will give you a starting point as to home much of a difference the 2 balls have, and how much you need to move.
http://www.theultimatebowlingguide.t...-anthony-pepe/
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