I think the RAD balls are spun at the factory, even then.......
With only 2.74 top weight you should still be fine getting the ball back to legal. Start with about a 1 inch bit going to about 2 3/4 or 3 inches deep. I bet that will get you close. You can always go deeper or use a bigger bit, or both.
2.74 top weight is really pretty low, the way Storm and Brunswick are making their balls right now, usually come with lots more than that!
Hope this helps ya....
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Mike Austin's Precision Pro Shop
Houston, TX
Drilling and Tech Advice BirdDogbowling.com
Driller to many "Stars" and Tony Melendez too!