The "Untakeable" design in Springsharp

I just tried the "Untakeable" design with 16-10in BLR and 16-4in QF guns in Springsharp. I was not satisfied with the result, as the displacement is too high for what it should be. I went with coal-fired boilers with turbines. I refuse to accept any design that is not stable, a good seaboat, and structurally sound. The only way to achieve the balance was to have a larger displacment and to adjust the slider in Springsharp to achieve adequate stability and reduced effects from firing the guns. This is the Springsharp report:

Untakeable, Great Britain Battleship laid down 1905

Displacement:
 19,835 t light; 20,781 t standard; 23,330 t normal; 25,369 t full load

Dimensions: Length overall / water x beam x draught
 530.84 ft / 530.00 ft x 83.00 ft x 29.00 ft (normal load)
 161.80 m / 161.54 m x 25.30 m  x 8.84 m

Armament:
      16 - 10.00" / 254 mm guns (8x2 guns), 500.00lbs / 226.80kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on side ends, evenly spread, 5 raised mounts - superfiring
      16 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in casemate mounts 
   on side ends, evenly spread, all raised mounts - superfiring
 Weight of broadside 8,512 lbs / 3,861 kg
 Shells per gun, main battery: 100

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 11.0" / 279 mm 380.00 ft / 115.82 m 16.00 ft / 4.88 m
 Ends: 6.00" / 152 mm 150.00 ft / 45.72 m 16.00 ft / 4.88 m
   Main Belt covers 110 % of normal length

   - Torpedo Bulkhead:
  1.50" / 38 mm 380.00 ft / 115.82 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 10.0" / 254 mm 6.00" / 152 mm  10.0" / 254 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Coal fired boilers, steam turbines, 
 Direct drive, 4 shafts, 31,118 shp / 23,214 Kw = 21.00 kts
 Range 6,500nm at 12.00 kts
 Bunker at max displacement = 4,588 tons (100% coal)

Complement:
 943 - 1,227

Cost:
 £1.951 million / $7.804 million

Distribution of weights at normal displacement:
 Armament: 1,064 tons, 4.6 %
 Armour: 8,347 tons, 35.8 %
    - Belts: 3,404 tons, 14.6 %
    - Torpedo bulkhead: 548 tons, 2.4 %
    - Armament: 2,983 tons, 12.8 %
    - Armour Deck: 1,236 tons, 5.3 %
    - Conning Tower: 176 tons, 0.8 %
 Machinery: 2,593 tons, 11.1 %
 Hull, fittings & equipment: 7,830 tons, 33.6 %
 Fuel, ammunition & stores: 3,495 tons, 15.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   31,565 lbs / 14,318 Kg = 63.1 x 10.0 " / 254 mm shells or 4.9 torpedoes
 Stability (Unstable if below 1.00): 1.03
 Metacentric height 4.0 ft / 1.2 m
 Roll period: 17.5 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.88
 Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.640
 Length to Beam Ratio: 6.39 : 1
 'Natural speed' for length: 23.02 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 39
 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:  24.00 ft / 7.32 m
    - Forecastle (20 %): 22.00 ft / 6.71 m
    - Mid (50 %):  22.00 ft / 6.71 m
    - Quarterdeck (15 %): 22.00 ft / 6.71 m
    - Stern:  22.00 ft / 6.71 m
    - Average freeboard: 22.16 ft / 6.75 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 93.3 %
  - Above water (accommodation/working, high = better): 148.4 %
 Waterplane Area: 33,393 Square feet or 3,102 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 158 lbs/sq ft or 770 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 1.76
  - 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