The Ger/CB/1905 (Flush-Decked) did not work as well

I followed the Ger/CB/1905 specification and drawing as closely as I could, but the ship cannot achieve the desired speed of 27 knots. 67,543 SHP is required to just reach 26 knots, much less 27 knots. This is based on a drawing that is similar in concept to the Ger/BB/1905 flush-decked battleship. I had to adjust the draft and displacement to achieve adequate strength. The seakeeping is not as good, due to the power required to reach even 26 knots. The hull weight is about 500 tons more than I had hoped for in my original design. This is the Springsharp report:

Ger/CB/1905, Germany Battle Cruiser laid down 1905 (Engine 1917)

Displacement:
 19,249 t light; 20,064 t standard; 22,000 t normal; 23,549 t full load

Dimensions: Length overall / water x beam x draught
 562.00 ft / 560.00 ft x 94.00 ft x 26.00 ft (normal load)
 171.30 m / 170.69 m x 28.65 m  x 7.92 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1905 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
 Weight of broadside 8,208 lbs / 3,723 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 10.0" / 254 mm 370.00 ft / 112.78 m 9.00 ft / 2.74 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 370.00 ft / 112.78 m 8.00 ft / 2.44 m
   Main Belt covers 102 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 370.00 ft / 112.78 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 8.00" / 203 mm 6.00" / 152 mm  10.0" / 254 mm
 2nd: 6.00" / 152 mm 6.00" / 152 mm  6.00" / 152 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 10.00" / 254 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 67,543 shp / 50,387 Kw = 26.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 3,485 tons

Complement:
 903 - 1,174

Cost:
 £1.882 million / $7.529 million

Distribution of weights at normal displacement:
 Armament: 1,026 tons, 4.7 %
 Armour: 7,623 tons, 34.6 %
    - Belts: 2,496 tons, 11.3 %
    - Torpedo bulkhead: 1,027 tons, 4.7 %
    - Armament: 1,868 tons, 8.5 %
    - Armour Deck: 2,063 tons, 9.4 %
    - Conning Tower: 169 tons, 0.8 %
 Machinery: 2,476 tons, 11.3 %
 Hull, fittings & equipment: 8,125 tons, 36.9 %
 Fuel, ammunition & stores: 2,751 tons, 12.5 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   32,035 lbs / 14,531 Kg = 37.1 x 12.0 " / 305 mm shells or 6.0 torpedoes
 Stability (Unstable if below 1.00): 1.18
 Metacentric height 6.2 ft / 1.9 m
 Roll period: 15.8 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.38
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.563
 Length to Beam Ratio: 5.96 : 1
 'Natural speed' for length: 23.66 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  26.00 ft / 7.92 m
    - Forecastle (20 %): 19.00 ft / 5.79 m
    - Mid (50 %):  19.00 ft / 5.79 m
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 19.56 ft / 5.96 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 91.0 %
  - Above water (accommodation/working, high = better): 149.0 %
 Waterplane Area: 37,174 Square feet or 3,454 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 160 lbs/sq ft or 783 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.95
  - Longitudinal: 1.64
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent