The Ger/CDV/1915 coast defense battleship design

When I just put the Ger/CDV/1915 coast defense battleship into Springsharp, my design goal was to make the weights and power match those in my paper specification and sketch from the early 1970's. I adjusted the gun caliber to see if I could get close to the armament weight. I adjusted the machinery date to get close to the 27 SHP/ton machinery weight. I adjusted the speed to come close to the specified 25,000 SHP. THere is no speed mentioned, just the power and machinery weight. This is the Springsharp report:

Ger/CDV/1915, Germany Coast Defense Battleship laid down 1915 (Engine 1917)

Displacement:
 15,939 t light; 16,705 t standard; 17,800 t normal; 18,676 t full load

Dimensions: Length overall / water x beam x draught
 450.00 ft / 450.00 ft x 90.00 ft x 25.00 ft (normal load)
 137.16 m / 137.16 m x 27.43 m  x 7.62 m

Armament:
      6 - 14.00" / 356 mm guns (2x3 guns), 1,372.00lbs / 622.33kg shells, 1915 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 9,096 lbs / 4,126 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 12.0" / 305 mm 260.00 ft / 79.25 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 89 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 260.00 ft / 79.25 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 12.0" / 305 mm 8.00" / 203 mm  11.0" / 279 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 4.50" / 114 mm, Conning tower: 11.00" / 279 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 25,104 shp / 18,728 Kw = 20.30 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 1,970 tons

Complement:
 769 - 1,001

Cost:
 £2.388 million / $9.552 million

Distribution of weights at normal displacement:
 Armament: 1,137 tons, 6.4 %
 Armour: 7,320 tons, 41.1 %
    - Belts: 2,330 tons, 13.1 %
    - Torpedo bulkhead: 962 tons, 5.4 %
    - Armament: 1,365 tons, 7.7 %
    - Armour Deck: 2,501 tons, 14.1 %
    - Conning Tower: 162 tons, 0.9 %
 Machinery: 920 tons, 5.2 %
 Hull, fittings & equipment: 6,561 tons, 36.9 %
 Fuel, ammunition & stores: 1,861 tons, 10.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   26,588 lbs / 12,060 Kg = 19.4 x 14.0 " / 356 mm shells or 5.8 torpedoes
 Stability (Unstable if below 1.00): 1.21
 Metacentric height 6.0 ft / 1.8 m
 Roll period: 15.4 seconds
 Steadiness - As gun platform (Average = 50 %): 61 %
   - Recoil effect (Restricted arc if above 1.00): 0.42
 Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.615
 Length to Beam Ratio: 5.00 : 1
 'Natural speed' for length: 21.21 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  23.00 ft / 7.01 m
    - Forecastle (20 %): 20.00 ft / 6.10 m
    - Mid (50 %):  20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
    - Quarterdeck (15 %): 12.00 ft / 3.66 m
    - Stern:  12.00 ft / 3.66 m
    - Average freeboard: 16.24 ft / 4.95 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 83.0 %
  - Above water (accommodation/working, high = better): 116.8 %
 Waterplane Area: 30,047 Square feet or 2,791 Square metres
 Displacement factor (Displacement / loading): 97 %
 Structure weight / hull surface area: 166 lbs/sq ft or 809 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.13
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is adequate
 Good seaboat, rides out heavy weather easily