The J/DD/1941 is disappointing

I had hoped that the J/DD/1941 could have a speed of 36 knots, but the cost is too great. Springsharp continues to be a problem because the power required is greater than it should be. I had to be content to raise the range to 7,200nm at 15 knots. This is the Springsharp report:

J/DD/1941, Japan Destroyer laid down 1941 (Engine 1950)

Displacement:
 1,980 t light; 2,061 t standard; 2,390 t normal; 2,653 t full load

Dimensions: Length overall / water x beam x draught
 377.36 ft / 375.00 ft x 36.00 ft x 13.00 ft (normal load)
 115.02 m / 114.30 m x 10.97 m  x 3.96 m

Armament:
      6 - 5.00" / 127 mm guns (3x2 guns), 62.50lbs / 28.35kg shells, 1941 Model
   Dual purpose guns in deck mounts with hoists
   on centreline, evenly spread
   Aft Main mounts separated by engine room
      16 - 2.24" / 57.0 mm guns (8x2 guns), 5.65lbs / 2.56kg shells, 1941 Model
   Anti-aircraft guns in deck mounts 
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 465 lbs / 211 kg
 Shells per gun, main battery: 120
 10 - 24.0" / 609.6 mm above water torpedoes

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 62,044 shp / 46,285 Kw = 35.00 kts
 Range 7,200nm at 15.00 kts
 Bunker at max displacement = 592 tons

Complement:
 170 - 222

Cost:
 £1.794 million / $7.174 million

Distribution of weights at normal displacement:
 Armament: 58 tons, 2.4 %
 Machinery: 1,228 tons, 51.4 %
 Hull, fittings & equipment: 693 tons, 29.0 %
 Fuel, ammunition & stores: 410 tons, 17.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   592 lbs / 269 Kg = 9.5 x 5.0 " / 127 mm shells or 0.3 torpedoes
 Stability (Unstable if below 1.00): 1.33
 Metacentric height 1.8 ft / 0.5 m
 Roll period: 11.3 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.56
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has rise forward of midbreak, raised quarterdeck 
 Block coefficient: 0.477
 Length to Beam Ratio: 10.42 : 1
 'Natural speed' for length: 19.36 kts
 Power going to wave formation at top speed: 70 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 1.00 ft / 0.30 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (37 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m (14.00 ft / 4.27 m before break)
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 17.96 ft / 5.47 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 184.2 %
  - Above water (accommodation/working, high = better): 55.0 %
 Waterplane Area: 8,809 Square feet or 818 Square metres
 Displacement factor (Displacement / loading): 70 %
 Structure weight / hull surface area: 36 lbs/sq ft or 173 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 2.58
  - Overall: 0.53
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is cramped