The GB/DD/1937 is big enough to have a 15 knot cruising speed

The GB/DD/1937 is big an fast, and has a range of 5,600nm at 15 knots (finally). This seems a great improvement over the puny 12 knot cruising speeds of its predecessors. I had looked at what could be improved that would give the greatest benefit, and cruising speed seemed to be "it". This is the Springsharp report:

GB/DD/1937, Great Britain Destroyer laid down 1937 (Engine 1947)

Displacement:
2,000 t light; 2,103 t standard; 2,350 t normal; 2,548 t full load

Dimensions: Length overall / water x beam x draught
373.75 ft / 372.00 ft x 36.00 ft x 15.00 ft (normal load)
113.92 m / 113.39 m x 10.97 m  x 4.57 m

Armament:
     8 - 4.70" / 119 mm guns (4x2 guns), 51.91lbs / 23.55kg shells, 1937 Model
  Quick firing guns in deck mounts with hoists
  on centreline ends, evenly spread, 1 raised mount - superfiring
     1 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1937 Model
  Anti-aircraft gun in a deck mount with hoist
  on side amidships
     16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1937 Model
  Anti-aircraft guns in deck mounts
  on side, evenly spread, 2 raised mounts
Weight of broadside 479 lbs / 217 kg
Shells per gun, main battery: 200
10 - 21.0" / 533.4 mm above water torpedoes

Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 62,213 shp / 46,411 Kw = 37.00 kts
Range 5,600nm at 15.00 kts
Bunker at max displacement = 445 tons

Complement:
168 - 219

Cost:
£1.599 million / $6.395 million

Distribution of weights at normal displacement:
Armament: 60 tons, 2.5 %
Machinery: 1,235 tons, 52.5 %
Hull, fittings & equipment: 705 tons, 30.0 %
Fuel, ammunition & stores: 350 tons, 14.9 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
  539 lbs / 245 Kg = 10.4 x 4.7 " / 119 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.34
Metacentric height 1.8 ft / 0.6 m
Roll period: 11.2 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
  - Recoil effect (Restricted arc if above 1.00): 0.65
Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
Hull has rise forward of midbreak
  and transom stern
Block coefficient: 0.409
Length to Beam Ratio: 10.33 : 1
'Natural speed' for length: 22.22 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
   - Stem:  25.00 ft / 7.62 m
   - Forecastle (20 %): 23.00 ft / 7.01 m
   - Mid (36 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
   - Quarterdeck (15 %): 15.00 ft / 4.57 m
   - Stern:  15.00 ft / 4.57 m
   - Average freeboard: 18.04 ft / 5.50 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 189.7 %
 - Above water (accommodation/working, high = better): 80.4 %
Waterplane Area: 8,605 Square feet or 799 Square metres
Displacement factor (Displacement / loading): 66 %
Structure weight / hull surface area: 36 lbs/sq ft or 176 Kg/sq metre
Hull strength (Relative):
 - Cross-sectional: 0.42
 - Longitudinal: 2.96
 - Overall: 0.51
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped