Is the material and moulding process such that durability suffers with lighter hulls? Could not lighter and more refined shaped hulls in addition to a larger rig, without the complexities of a high performance mast and daggers, produce a boat capable of a 10% speed increase?
One of the problems in making rotomolded hulls is that the material does not have stiffness in flat panels. Due to the manufacturing process, putting in stiffening members (frames and stringers) is very hard, and would add more weight. So you need to design in support in the hull shape itself, or compensate with thicker hulls. So there will be limits to what you can achieve with this construction technique.