The 35,000 ton 35 knot battlecruiser didn't work out so well

I took the opportunity to try the 35,000 ton 35 knot battlecruiser design that had 8-15 in guns. I didn't do so well, as I had to increase the draft and displacement and reduce the speed to 33 knots. A 33-knot battlecruiser with 8-15in guns is not too bad, but it fell short of the original concept. This is the Springsharp report:

Ger/CB/1915 Design study 35K, Enter country Enter ship type laid down 1915 (Engine 1927)

Displacement:
 37,148 t light; 38,730 t standard; 42,350 t normal; 45,246 t full load

Dimensions: Length overall / water x beam x draught
 851.15 ft / 850.00 ft x 105.00 ft x 31.00 ft (normal load)
 259.43 m / 259.08 m x 32.00 m  x 9.45 m

Armament:
      8 - 15.00" / 381 mm guns (4x2 guns), 1,687.50lbs / 765.44kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      16 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 14,500 lbs / 6,577 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 8.00" / 203 mm 650.00 ft / 198.12 m 17.00 ft / 5.18 m
 Ends: Unarmoured
   Main Belt covers 118 % of normal length

   - Torpedo Bulkhead:
  2.00" / 51 mm 650.00 ft / 198.12 m 24.00 ft / 7.32 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  8.00" / 203 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 3.00" / 76 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 211,338 shp / 157,658 Kw = 33.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 6,517 tons

Complement:
 1,475 - 1,918

Cost:
 £5.464 million / $21.857 million

Distribution of weights at normal displacement:
 Armament: 1,813 tons, 4.3 %
 Armour: 10,853 tons, 25.6 %
    - Belts: 3,649 tons, 8.6 %
    - Torpedo bulkhead: 1,154 tons, 2.7 %
    - Armament: 2,403 tons, 5.7 %
    - Armour Deck: 3,411 tons, 8.1 %
    - Conning Tower: 236 tons, 0.6 %
 Machinery: 6,671 tons, 15.8 %
 Hull, fittings & equipment: 17,811 tons, 42.1 %
 Fuel, ammunition & stores: 5,202 tons, 12.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   59,532 lbs / 27,003 Kg = 35.3 x 15.0 " / 381 mm shells or 7.7 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 7.0 ft / 2.1 m
 Roll period: 16.7 seconds
 Steadiness - As gun platform (Average = 50 %): 63 %
   - Recoil effect (Restricted arc if above 1.00): 0.71
 Seaboat quality  (Average = 1.00): 1.26

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.536
 Length to Beam Ratio: 8.10 : 1
 'Natural speed' for length: 29.15 kts
 Power going to wave formation at top speed: 53 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 31.00 ft / 9.45 m
    - Mid (67 %):  31.00 ft / 9.45 m (23.00 ft / 7.01 m aft of break)
    - Quarterdeck (15 %): 23.00 ft / 7.01 m
    - Stern:  23.00 ft / 7.01 m
    - Average freeboard: 28.52 ft / 8.69 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 103.0 %
  - Above water (accommodation/working, high = better): 228.5 %
 Waterplane Area: 61,461 Square feet or 5,710 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 197 lbs/sq ft or 962 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.39
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily