Jeff -- Sorry, something very strange happened above with SailNet treating my post as an edit to yours! I've no idea what's happening but let me try to get my whole post in.
The sails, mast, and rig also have a big role to play in making the boat stable and sea-kindly. The wind pushing against the sails is generally a good, stabilizing force; in general a sailboat in a good breeze is going to roll less and be more comfortable than a motorboat or the sailboat with its sails down, to give a simple example. With the sails up, some weight aloft can be a good thing. But, as in the example Jeff gave above, we know that too much weight aloft can be bad.
Sail trim and efficient rig set up can also be vital to comfort. For example, some boats are very poorly set up for, say, long-distance downwind work in light air and their sails slat back and forth, gear is subject to terrible chafe, the poor trim calls for lots of work from the helmsperson or autopilot, and the poor boat barely moves. But, with the rig and sails properly set up and trimmed, many of these difficulties could go away and the crew could be much more comfortable.
Another very basic notion that racing sailors and cruisers try to practice is getting weight into the center of the boat to reduce violent pitching motion and help the boat go more easily through the waves.
One other bit of knowledge that might be helpful to newer sailors in this discussion is a refresher on the axes of motion through which a boat can move. East coast artist "Bowsprite" did a very lovely and fun blog post called
"Six Degrees of Freedom and the Drunken Sailor"
( six degrees of freedom and the drunken sailor « Bowsprite: A New York Harbor Sketchbook
Heaving - moving up and down (linear, along y-axis),
Swaying - moving left and right (linear, along x-axis),
Surging - moving forward and backward (linear, fore and aft),
Pitching - tilting forward and backward (rotational, along y-axis about the center point),
Yawing - turning left and right (rotational, change heading side to side), and
Rolling - tilting side to side (rotational, about horizontal fore and aft center line)
Describing and providing for all of these motions is part of a good designer's job, IMHO.
Jeff, are Hull Draft and Displacement Volume in the formula measured in meters and cubic meters? I think my computer cut off or mangled the end of your post.