Hi Dave,
There is no rule or law that says just because a boat is xft wide or 20ft wide that in light winds the sailors must sit on the windward hull and or trapeze from the windward hull in all sailing conditions. Both sailors can sit on the leeward hull and fly a hull in 5 knots. Both sailors can sit in the middle of the trampoline and generate righting moment using a 10ft lever arm. Both sailors can sit on the windward hull and hike with a 20ft lever arm and fly a hull in 15 knots of wind. Both sailors can trapeze from the windward hull, 20ft lever arm, and fly a hull in 20 knots of wind and go like a rocket to windward. Just because your boat is 20ft wide you don't have to use the full width until you need it. Just because your boat has an 8:1, or 10:1, or 12:1 mechanical advantage mainsheet, you don't have to sheet your sail in as hard as you can pull it and make the sail board flat in light winds. The same is true for righting moment. You trim the boat out to what you need for best speed. That goes for sail trim, fore and aft hull trim and righting moment trim.
Bill