You craft you are showing has a hard chine hull with a flare bow. This hull configuration is designed to plane. At the speed you mentioned, 11.5 knots, the hull will be deeper than design draught, bow up, stern down, and will generate heavy wake waves. Get her up over 15 knots, you'll find the arse end rises up, speed will pick up for less power requirement and the heavy bow wave will flatten out. You may need trim tabs on the transom to give the initial lift to the stern. If you can't get up to the plane, either you have too much weight in the superstructure, or you need more power.
A bulbous bow is designed to reduce the first standing wave on a submerged bow. A flared bow and hard chine hull is designed to lift the craft out of the water to some extent, the bow is not submerged, so a bulbous bow would have no effect.
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