Wait a minute...I gotta admit, I got lost in all that parent child relationship stuff . It's an easy misconception that making the boat wider loads the leeward hull equally more but it just 'aint so. For the most part (there is a small exception when considering the foward drive of the sails on the bow) I believe the leeward hull's buoyancy is only supporting the weight of the boat and the sailors. The additional righting moment only induces less rotational moment around the leeward hull. The mast, rigging, beams, boards, rudders, etc....just about everything else on the boat DOES carry more loading as the stresses go up but this stress exists between the sail and it's contact points to the windward hull where all the extra righting moment is. The leeward hull is supporting the same weight - it just has more advantage because it's farther out.