Alternate armament for the anachronistic Warrior

Eventually, the Warrior was armed with 4-8in MLR, 28-7in MLR, and 4-20pdr BLR. These would translate, using my system for choosing more modern guns, to 4-6.5in/45, 28-5.5in/50, and 4-57mm (6pdr) QF guns. I just made a Springsharp design for the Warrior with this armament. I tweaked some things and decided that the ship needed a torpedo bulkhead. The cruising speed needed to be reduced, to allow for the new armament and torpedo bulkhead. This is the Springsharp report:

Warrior, anachronistic version, Great Britain Armoured Cruiser laid down 1907

Displacement:
 7,949 t light; 8,360 t standard; 9,210 t normal; 9,890 t full load

Dimensions: Length overall / water x beam x draught
 401.15 ft / 398.00 ft x 58.25 ft x 26.00 ft (normal load)
 122.27 m / 121.31 m x 17.75 m  x 7.92 m

Armament:
      4 - 6.50" / 165 mm guns (2x2 guns), 140.00lbs / 63.50kg shells, 1907 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread
      28 - 5.50" / 140 mm guns in single mounts, 85.00lbs / 38.56kg shells, 1907 Model
   Breech loading guns in casemate mounts 
   on side, evenly spread
   16 guns in hull casemates - Limited use in heavy seas
      4 - 2.24" / 57.0 mm guns in single mounts, 6.00lbs / 2.72kg shells, 1907 Model
   Breech loading guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 2,964 lbs / 1,344 kg
 Shells per gun, main battery: 120

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.50" / 114 mm 235.00 ft / 71.63 m 24.00 ft / 7.32 m
 Ends: Unarmoured
   Main Belt covers 91 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 235.00 ft / 71.63 m 26.00 ft / 7.92 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.50" / 114 mm 3.00" / 76 mm  4.50" / 114 mm
 2nd: 2.00" / 51 mm 2.00" / 51 mm  2.00" / 51 mm
 3rd: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

   - Armour deck: 1.00" / 25 mm, Conning tower: 4.50" / 114 mm

Machinery:
 Coal fired boilers, complex reciprocating steam engines, 
 Direct drive, 2 shafts, 26,614 ihp / 19,854 Kw = 23.00 kts
 Range 4,800nm at 12.00 kts
 Bunker at max displacement = 1,530 tons (100% coal)

Complement:
 469 - 611

Cost:
 £0.997 million / $3.987 million

Distribution of weights at normal displacement:
 Armament: 363 tons, 3.9 %
 Armour: 2,039 tons, 22.1 %
    - Belts: 1,121 tons, 12.2 %
    - Torpedo bulkhead: 226 tons, 2.5 %
    - Armament: 354 tons, 3.8 %
    - Armour Deck: 295 tons, 3.2 %
    - Conning Tower: 43 tons, 0.5 %
 Machinery: 2,957 tons, 32.1 %
 Hull, fittings & equipment: 2,590 tons, 28.1 %
 Fuel, ammunition & stores: 1,261 tons, 13.7 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   5,587 lbs / 2,534 Kg = 40.7 x 6.5 " / 165 mm shells or 1.0 torpedoes
 Stability (Unstable if below 1.00): 1.33
 Metacentric height 3.7 ft / 1.1 m
 Roll period: 12.7 seconds
 Steadiness - As gun platform (Average = 50 %): 89 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.45

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.535
 Length to Beam Ratio: 6.83 : 1
 'Natural speed' for length: 19.95 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 61
 Bow angle (Positive = bow angles forward): 3.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  22.00 ft / 6.71 m
    - Forecastle (20 %): 18.00 ft / 5.49 m
    - Mid (50 %):  18.00 ft / 5.49 m
    - Quarterdeck (15 %): 18.00 ft / 5.49 m
    - Stern:  18.00 ft / 5.49 m
    - Average freeboard: 18.32 ft / 5.58 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 204.1 %
  - Above water (accommodation/working, high = better): 116.6 %
 Waterplane Area: 15,951 Square feet or 1,482 Square metres
 Displacement factor (Displacement / loading): 85 %
 Structure weight / hull surface area: 96 lbs/sq ft or 468 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.76
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is extremely poor
 Room for accommodation and workspaces is adequate
 Ship has slow, easy roll, a good, steady gun platform
 Good seaboat, rides out heavy weather easily