I have been using 14 for about 2.5 years and I don't see any difference in carry.
If anything I think I carry better with 14 than I did 15.
I leave quite a few 9 pins so I don't think that there is a lack of hit.
I feel that I can do more with the ball using 14, I can more easily change my axis tilt, axis rotation and can get an extra MPH of speed when I have to. I saw about a 10% increase in my rev rate too.
If you think about it, it makes sense that I would actually gain carry.
15# - 14# - .066 decrease
Ave MPH 15 to 16 - .066 increase
Ave RPM 270 to 300 - .11 increase
Based on that the 14# ball actually has more Momentum and Rotational Energy/Angular Kinetic Energy. My physics are a bit rusty so I don't remember all the formulas to come up with hard numbers but I do know that momentum is Mass x Velocity and if a rotating object has more momentum it also has more Kinetic Energy.
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