The prime motivation for raking the bow in reverse is to use less material (smaller surface area for same overall waterline length as well as the obvious result of carrying the bow bouancy lower, therefore less weight (no matter how little the difference it all counts especially in the “ends” of a hull). The effects of an aft raked bow over a vertical one is of an unmeasurable performance difference (if there is any difference at all) To have a "bulb" entry at the bottom of the bow on a cat is very debatable. The bulb effect is of value primarily only if it is maintained continually beneath the water surface level, if it breaks the surface it generates much more drag than a fine entry.