Normally on mass bias balls you don't do a "basic label" drill. That places the MB (even though this ball does not have a high mass bias, it is still significant) on the track side of the thumb hole and too close to the track. This reduces the backend. Maybe, based on your release specs (PAP, tilt, rotation, ball speed) ,you might be able to use the MB slightly on the track side of the thumb hole, if your revrate to ball speed ratio is high enough.
Wait for some of the Track gurus to show up, possibly tonight, possibly tomorrow (it's Saturday night, after all) for a more detailed explanation and further assistance.
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"None are so blind as those who will not see."