Message Sawbones as he has had tremendous success with his BCB, including carry down, I believe. Also he has been able to play deeper than he normally can. Ask him about the drill layout, and if he did anything to the cover as well as hopw well he likes it. You can also ask Saw Mill, T-God, and Nicanor about carrydown on this ball.
Keep in mind that it is also a case of the bowler matching up to the ball. For example, some people have reported problems with carry down with the Emerald, while I have never had any problems with carry down on the emerald. I would guess the same goes for the BCB.
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In the old days, they used axes to chop up wood...Nowadays, they use "BUZZSAWS".