A GB/CB/1916 design with better protection

This design is to answer the question about how fast a GB/CB/1916 design ship could be with 12in armour. This is the Springsharp report:

GB/CB/1916 Protected, Great Britain Battlecruiser laid down 1916 (Engine 1921)

Displacement:
 42,991 t light; 44,696 t standard; 47,073 t normal; 48,975 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (862.86 ft / 855.00 ft) x 105.00 ft x (31.00 / 32.02 ft)
 (263.00 m / 260.60 m) x 32.00 m  x (9.45 / 9.76 m)

Armament:
      6 - 16.50" / 419 mm 45.0 cal guns - 2,265.00lbs / 1,027.39kg shells, 90 per gun
   Breech loading guns in turret on barbette mounts, 1916 Model
   2 x Triple mounts on centreline, forward deck forward
  1 raised mount - superfiring
      10 - 6.00" / 152 mm 45.0 cal guns - 100.00lbs / 45.36kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1916 Model
   10 x Single mounts on sides, forward deck aft
  2 raised mounts - superfiring
      Weight of broadside 14,590 lbs / 6,618 kg

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 485.00 ft / 147.83 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 485.00 ft / 147.83 m 8.00 ft / 2.44 m
   Main Belt covers 87 % of normal length
   Main belt does not fully cover magazines and engineering spaces
   Main Belt inclined -12.00 degrees (positive = in)

   - Torpedo Bulkhead - Additional damage containing bulkheads:
  2.00" / 51 mm 485.00 ft / 147.83 m 31.00 ft / 9.45 m
 Beam between torpedo bulkheads 64.00 ft / 19.51 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  12.0" / 305 mm
 2nd: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Armoured deck - multiple decks:
 For and Aft decks: 3.00" / 76 mm
 Forecastle: 3.00" / 76 mm  Quarter deck: 3.00" / 76 mm

   - Conning towers: Forward 12.00" / 305 mm, Aft 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 292,552 shp / 218,244 Kw = 35.00 kts
 Range 5,400nm at 16.00 kts
 Bunker at max displacement = 4,279 tons

Complement:
 1,597 - 2,077

Cost:
 £7.011 million / $28.045 million

Distribution of weights at normal displacement:
 Armament: 2,467 tons, 5.2 %
    - Guns: 2,467 tons, 5.2 %
 Armour: 11,486 tons, 24.4 %
    - Belts: 3,362 tons, 7.1 %
    - Torpedo bulkhead: 1,113 tons, 2.4 %
    - Armament: 2,808 tons, 6.0 %
    - Armour Deck: 3,642 tons, 7.7 %
    - Conning Towers: 562 tons, 1.2 %
 Machinery: 10,074 tons, 21.4 %
 Hull, fittings & equipment: 18,964 tons, 40.3 %
 Fuel, ammunition & stores: 4,082 tons, 8.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   57,998 lbs / 26,307 Kg = 25.8 x 16.5 " / 419 mm shells or 6.6 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 6.9 ft / 2.1 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.68
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has low quarterdeck ,
   an extended bulbous bow and a cruiser stern
 Block coefficient (normal/deep): 0.592 / 0.596
 Length to Beam Ratio: 8.14 : 1
 'Natural speed' for length: 29.24 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 12.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  37.00 ft / 11.28 m,  32.00 ft / 9.75 m
    - Forward deck: 30.00 %,  32.00 ft / 9.75 m,  30.00 ft / 9.14 m
    - Aft deck: 22.00 %,  30.00 ft / 9.14 m,  30.00 ft / 9.14 m
    - Quarter deck: 28.00 %,  22.00 ft / 6.71 m,  23.00 ft / 7.01 m
    - Average freeboard:  29.00 ft / 8.84 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 157.1 %
  - Above water (accommodation/working, high = better): 237.7 %
 Waterplane Area: 65,170 Square feet or 6,055 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 208 lbs/sq ft or 1,017 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.39
  - Overall: 1.00
 Cramped machinery, storage, compartmentation space
 Excellent accommodation and workspace room