Kirkhill, I think I am close to giving up.
First, lets compare on comparable basis and you may see some light. Emma: 170000 GT, Triple EEE 190000: Difference 20000, but that is volume. Still: you can use to compare size: EEE are 15% bigger in volume. But Emma is 157000 DWT while the EEE will be 165000 DWT: only 8000 tonnes, or 5% heavier. For that difference, the EEE's have 86000 BHp engines compared to 109000 BHp engine for Emma - So Emma is ton for ton 28% more powerful, for a gain of only 2 knots of speed. And that is a good rule of thumb: the faster you go through water, the more power you need (almost exponentially) to gain an extra knot of speed. Hull form or not, there are no engines (Remember Emma has the largest diesel engine in the world) that you could usefully design to get a EEE to speeds of 44 knots, unless it was a hydrofoil (and it ain't).
Also: we don't deal with mass of water but with weight of water, We are on earth and its all gravity affected. These are different physics concept and the difference does matter in questions of speed, force, stability, etc. of a ship. Also, look at the difference between Emma and EEE's: there is an 8000 tonnes difference in DWT and a difference of roughly 2000 TEU container carrying capacity: This gives you an average weight of 4 tonnes per container, which is about right. While some containers may carry up to 14 tonnes, I would say 4 tonnes average weight is about right, with about 1 1/2 tonne of it being the container itself. (Think about it this way: I could ship scrap metal in a container and it would be heavy, but more often than not, a container from Asia will carry a bunch of television sets. How much does a flat screen Tv in its box weigh for the volume it occupies? Not much.) So Emma may carry (16000 TEU at 4 t.) 64000 tonnes of cargo to Europe and come back with mostly empties (16000 at 1 1/2 t.) weighing in at 24000 tonnes of cargo.
Finally, while your "sail area" will affect your permanent list in a cross wind , it has only a very minor effect on ship stability, merchant or otherwise, unless you are going through a hurricane.