My alternate 20in-gunned ship

This is my idea of what the 20in-gunned battlecruiser laid down in 1916 should have been like. The ship is still 1,000ft long and armed with 6-20in guns. I was able to achieve a speed of 31 knots by increasing the beam, draft, and displacement. I kept the armouring plan of the Incomparable, with a 10in belt and 4in deck. This is the Springsharp report:

Alternate 20in gunned ship, Great Britain Battlecruiser laid down 1916

Displacement:
 58,983 t light; 61,511 t standard; 64,700 t normal; 67,251 t full load

Dimensions: Length overall / water x beam x draught
 1,001.73 ft / 1,000.00 ft x 112.00 ft x 28.00 ft (normal load)
 305.33 m / 304.80 m x 34.14 m  x 8.53 m

Armament:
      6 - 20.00" / 508 mm guns (3x2 guns), 4,000.00lbs / 1,814.37kg shells, 1916 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      9 - 4.00" / 102 mm guns (3x3 guns), 32.00lbs / 14.51kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on centreline ends, majority aft, all raised mounts - superfiring
      6 - 4.00" / 102 mm guns (2x3 guns), 32.00lbs / 14.51kg shells, 1916 Model
   Quick firing guns in deck mounts with hoists
   on centreline, all amidships, all raised mounts - superfiring
      4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1916 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 24,534 lbs / 11,128 kg
 Shells per gun, main battery: 90
 8 - 21.0" / 533.4 mm submerged torpedo tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 640.00 ft / 195.07 m 8.00 ft / 2.44 m
 Ends: 4.00" / 102 mm 320.00 ft / 97.54 m 8.00 ft / 2.44 m
   40.00 ft / 12.19 m Unarmoured ends
 Upper: 8.00" / 203 mm 640.00 ft / 195.07 m 8.00 ft / 2.44 m
   Main Belt covers 98 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 640.00 ft / 195.07 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 14.0" / 356 mm 8.00" / 203 mm  14.0" / 356 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm
 3rd: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 219,359 shp / 163,642 Kw = 31.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 5,740 tons

Complement:
 2,027 - 2,636

Cost:
 £9.466 million / $37.863 million

Distribution of weights at normal displacement:
 Armament: 3,067 tons, 4.7 %
 Armour: 16,575 tons, 25.6 %
    - Belts: 4,297 tons, 6.6 %
    - Torpedo bulkhead: 1,326 tons, 2.0 %
    - Armament: 3,830 tons, 5.9 %
    - Armour Deck: 6,774 tons, 10.5 %
    - Conning Tower: 347 tons, 0.5 %
 Machinery: 8,173 tons, 12.6 %
 Hull, fittings & equipment: 31,169 tons, 48.2 %
 Fuel, ammunition & stores: 5,717 tons, 8.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   91,222 lbs / 41,378 Kg = 22.8 x 20.0 " / 508 mm shells or 11.5 torpedoes
 Stability (Unstable if below 1.00): 1.19
 Metacentric height 8.2 ft / 2.5 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 56 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.12

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.722
 Length to Beam Ratio: 8.93 : 1
 'Natural speed' for length: 31.62 kts
 Power going to wave formation at top speed: 47 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 28.00 ft / 8.53 m
    - Mid (67 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 25.76 ft / 7.85 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 96.3 %
  - Above water (accommodation/working, high = better): 221.8 %
 Waterplane Area: 91,546 Square feet or 8,505 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 257 lbs/sq ft or 1,255 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.23
  - Longitudinal: 0.94
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent