The latest attempt at the GB/CA/1912 design worked well

I just tried redesigning the GB/CA/1912 fast armoured cruiser design in Springsharp, and the result works quite well. This is inspired by my design efforts in the mid-1970's for alternative fast armoured cruiser designs that would have been built instead of battlecruisers. This version only uses technology appropriate to the date. This is a 650ft ship with 12-9.2in BLR and 12-6in QF guns. The armour basis is 6 inches. This is the Springsharp report:

GB/CA/1912, Great Britain Armoured Cruiser laid down 1912

Displacement:
 18,576 t light; 19,327 t standard; 20,684 t normal; 21,769 t full load

Dimensions: Length overall / water x beam x draught
 650.00 ft / 650.00 ft x 75.00 ft x 27.00 ft (normal load)
 198.12 m / 198.12 m x 22.86 m  x 8.23 m

Armament:
      12 - 9.20" / 234 mm guns (6x2 guns), 380.00lbs / 172.37kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, evenly spread, 3 raised mounts
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
   12 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 5,856 lbs / 2,656 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 450.00 ft / 137.16 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 200.00 ft / 60.96 m 17.00 ft / 5.18 m
   Main Belt covers 107 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 450.00 ft / 137.16 m 23.00 ft / 7.01 m

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

   - Armour deck: 2.00" / 51 mm, Conning tower: 6.00" / 152 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 102,247 shp / 76,276 Kw = 30.00 kts
 Range 7,200nm at 12.00 kts
 Bunker at max displacement = 2,442 tons

Complement:
 862 - 1,121

Cost:
 £1.848 million / $7.390 million

Distribution of weights at normal displacement:
 Armament: 746 tons, 3.6 %
 Armour: 5,722 tons, 27.7 %
    - Belts: 2,423 tons, 11.7 %
    - Torpedo bulkhead: 383 tons, 1.9 %
    - Armament: 1,561 tons, 7.5 %
    - Armour Deck: 1,259 tons, 6.1 %
    - Conning Tower: 97 tons, 0.5 %
 Machinery: 4,077 tons, 19.7 %
 Hull, fittings & equipment: 8,031 tons, 38.8 %
 Fuel, ammunition & stores: 2,108 tons, 10.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   26,091 lbs / 11,835 Kg = 67.0 x 9.2 " / 234 mm shells or 3.2 torpedoes
 Stability (Unstable if below 1.00): 1.05
 Metacentric height 3.6 ft / 1.1 m
 Roll period: 16.6 seconds
 Steadiness - As gun platform (Average = 50 %): 67 %
   - Recoil effect (Restricted arc if above 1.00): 0.93
 Seaboat quality  (Average = 1.00): 1.33

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.550
 Length to Beam Ratio: 8.67 : 1
 'Natural speed' for length: 25.50 kts
 Power going to wave formation at top speed: 54 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  32.00 ft / 9.75 m
    - Forecastle (20 %): 30.00 ft / 9.14 m
    - Mid (57 %):  30.00 ft / 9.14 m (22.00 ft / 6.71 m aft of break)
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 26.72 ft / 8.14 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 124.5 %
  - Above water (accommodation/working, high = better): 199.6 %
 Waterplane Area: 34,022 Square feet or 3,161 Square metres
 Displacement factor (Displacement / loading): 104 %
 Structure weight / hull surface area: 141 lbs/sq ft or 687 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.76
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily