A variant GB/CA/1912 armored cruiser with triple turrets

I tried several variants of the GB/CA/1912 armored cruiser concept. My first thought was to have a main armament of 9-9.2in/50 guns in triple turrets. The result seemed to be under-gunned, so I went with 12-9.2in/50 and 12-6in/50 QF guns . The 9.2in guns are in triple turrets with the 6in guns in casemates. The size is rather larger than I would like, but to obtain 30 knot speed with a 6in belt and 2.5in deck, size is what is needed. This is the Springsharp report:

GB/CA/1912B1, Great Britain Armored Cruiser laid down 1912 (Engine 1917)

Displacement:
 18,295 t light; 19,127 t standard; 20,985 t normal; 22,471 t full load

Dimensions: Length overall / water x beam x draught
 650.00 ft / 650.00 ft x 79.00 ft x 27.00 ft (normal load)
 198.12 m / 198.12 m x 24.08 m  x 8.23 m

Armament:
      12 - 9.20" / 234 mm guns (4x3 guns), 389.34lbs / 176.60kg shells, 1912 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 3 raised mounts - superfiring
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1912 Model
   Breech loading guns in casemate mounts 
   on side, all amidships
   12 guns in hull casemates - Limited use in heavy seas
 Weight of broadside 5,968 lbs / 2,707 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 6.00" / 152 mm 430.00 ft / 131.06 m 17.00 ft / 5.18 m
 Ends: 4.00" / 102 mm 200.00 ft / 60.96 m 17.00 ft / 5.18 m
   20.00 ft / 6.10 m Unarmoured ends
   Main Belt covers 102 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 430.00 ft / 131.06 m 23.00 ft / 7.01 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 4.00" / 102 mm  7.00" / 178 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 2.50" / 64 mm, Conning tower: 8.00" / 203 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 103,026 shp / 76,857 Kw = 30.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 3,345 tons

Complement:
 871 - 1,133

Cost:
 £1.796 million / $7.183 million

Distribution of weights at normal displacement:
 Armament: 746 tons, 3.6 %
 Armour: 5,746 tons, 27.4 %
    - Belts: 2,359 tons, 11.2 %
    - Torpedo bulkhead: 366 tons, 1.7 %
    - Armament: 1,264 tons, 6.0 %
    - Armour Deck: 1,626 tons, 7.8 %
    - Conning Tower: 131 tons, 0.6 %
 Machinery: 3,777 tons, 18.0 %
 Hull, fittings & equipment: 8,026 tons, 38.2 %
 Fuel, ammunition & stores: 2,690 tons, 12.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   26,981 lbs / 12,238 Kg = 69.3 x 9.2 " / 234 mm shells or 3.6 torpedoes
 Stability (Unstable if below 1.00): 1.12
 Metacentric height 4.3 ft / 1.3 m
 Roll period: 15.9 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.65
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.530
 Length to Beam Ratio: 8.23 : 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:  27.00 ft / 8.23 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (67 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.52 ft / 6.86 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 115.0 %
  - Above water (accommodation/working, high = better): 175.2 %
 Waterplane Area: 35,165 Square feet or 3,267 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 148 lbs/sq ft or 723 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.40
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent