Another attempt to achieve a higher speed

My strategy to achieve a higher speed for a battlecruiser is to reduce the armour, reduce the main armament caliber, and reduce the displacement. The new main armament is now 8-13.5in guns in two quadruple turrets mounted forward. The belt is reduced to 6in and the deck to 3in while the turrets faces and barbettes are 9in. The length was increased by 5ft and that added 1 percent to the seakeeping. The normal displacement is now 39,800 tons. All that now produces a maximum speed of 38.5 knots. I also lightened the machinery so that the maximum speed is produced by machinery that is 36 SHP/ton. This is the Springsharp report:

GB/CB/1921 Very Fast, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 36,563 t light; 37,953 t standard; 39,800 t normal; 41,278 t full load

Dimensions: Length overall / water x beam x draught
 875.24 ft / 872.00 ft x 101.00 ft x 31.00 ft (normal load)
 266.77 m / 265.79 m x 30.78 m  x 9.45 m

Armament:
      8 - 13.50" / 343 mm guns (2x4 guns), 1,230.19lbs / 558.00kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward, 1 raised mount - superfiring
      16 - 5.50" / 140 mm guns (8x2 guns), 83.19lbs / 37.73kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all aft
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 2.00lbs / 0.91kg shells, 1921 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread
 Weight of broadside 11,532 lbs / 5,231 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 440.00 ft / 134.11 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 4.00" / 102 mm 440.00 ft / 134.11 m 8.00 ft / 2.44 m
   Main Belt covers 78 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  2.00" / 51 mm 440.00 ft / 134.11 m 31.00 ft / 9.45 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 6 shafts, 313,427 shp / 233,816 Kw = 38.50 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 3,325 tons

Complement:
 1,408 - 1,831

Cost:
 £9.435 million / $37.740 million

Distribution of weights at normal displacement:
 Armament: 1,441 tons, 3.6 %
 Armour: 8,493 tons, 21.3 %
    - Belts: 1,558 tons, 3.9 %
    - Torpedo bulkhead: 1,009 tons, 2.5 %
    - Armament: 2,305 tons, 5.8 %
    - Armour Deck: 3,419 tons, 8.6 %
    - Conning Tower: 201 tons, 0.5 %
 Machinery: 8,687 tons, 21.8 %
 Hull, fittings & equipment: 17,942 tons, 45.1 %
 Fuel, ammunition & stores: 3,237 tons, 8.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   49,950 lbs / 22,657 Kg = 40.6 x 13.5 " / 343 mm shells or 5.6 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 6.3 ft / 1.9 m
 Roll period: 16.9 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.62
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.510
 Length to Beam Ratio: 8.63 : 1
 'Natural speed' for length: 34.06 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  37.00 ft / 11.28 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (50 %):  30.00 ft / 9.14 m
    - Quarterdeck (15 %): 30.00 ft / 9.14 m
    - Stern:  30.00 ft / 9.14 m
    - Average freeboard: 30.56 ft / 9.31 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 122.2 %
  - Above water (accommodation/working, high = better): 250.0 %
 Waterplane Area: 61,610 Square feet or 5,724 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 195 lbs/sq ft or 953 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.58
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent