Destroyers for War in the Pacific

If a 2100 ton destroyer is good for Pacific War fighting, why not a 2200 ton destroyer? The Gearing class dimensions also seem to be pretty reasonable. I would have thought that I would at least go with a 390ft ship. I would probably use coefficients of Cp=0.66 and Cm=0.82. For my liking, I am seeing 390ft as too long for a ship whose NORMAL displacement is 2200 tons. The draft is too shallow to be reasonable. The problem is that a Standard Displacement is quite different from a normal displacement. The normal displacement needs to be at least 2400 tons. Given that, then the dimensions would be 370ft x 38ft x 11ft. The guns would still be 6-5.1in/50 with 10-21in TT. The speed need only be 34 knots.