I do not have the exact calculations for volume placement but I would be more than willing to bet against that statement. The Viper has huge volume in the middle of the hull near the beams, but a much narrower fore and aft even though the bow is deeper. This would provide the tendency to pitch more pronounced and also make it more difficult on crew position to keep the proper attitude making the boat less user friendly to sail fast.

Also the hulls appear to be more V shaped than some of the others. The width at free water line does not appear to ba any more. Added volume to a hull out of the water provides no benefit. Carrying more crew weight without the added volume already in the water provides no advantage.

If you look at the A they are removing hull from above the water. The under water lines are not varying with the new designs very much. More freeboard and width are required for a heavier 2 up boat, but I would venture to say that dynamics of the A class are the best (more refined than the other cat classes as they have been through the most development) for the part in the water. The Wild Cat and the Falcon both have take queues from this class.