The Mass Bias is stronger. My guess is that a stronger cover is on the ball as well. One of the things that Mr. Boomershine discussed in his demo of the original Cell, was maintaining Diff. through the motion of the ball going down the lane. With this theory, less total diff. can actually be stronger, because of the shape of the weight block. The weight block looks to be elongated at the top corners, allowing the ball to have the same or more diff. in the middle part of the balls spin time. Although personally, I am a big advocate of looking at the numbers, the shape of the core in relation to spin time, is a huge factor in ball motion.
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Tommy Gollick
Storm Regional/Pro Shop staff
Red Crown Pro Shop Harrisburg, PA
stormbowling.com