Dan,
Yes you are right, but the SU ratio is actually worse. A minimum ship of 3 hull has 250.27 SU a ship 30 times bigger a WW1, Destroyer to Dreadnought, would have 7508.10 SU giving a Hull of just over 41 hull. Now that's hull size creep!
I guess I'm not understanding your point, because I don't see how that is "worse". To represent a ship that has 30x the "tonnage", you need a hull size that is just under 14x larger.