My anachronistic HMS Mercury design

I have an anachronistic version of HMS Mercury, an early 2nd Class Cruiser. Her sister was the Iris. My version, being built, or rebuilt later, is much more capable. This version is a compact convoy cruiser with modest speed and range. This is the Springsharp report:

HMS Mercury, Great Britain 2nd Class Cruiser laid down 1910

Displacement:
    3,577 t light; 3,761 t standard; 4,300 t normal; 4,732 t full load

Dimensions: Length overall / water x beam x draught
    318.05 ft / 315.00 ft x 46.00 ft x 20.50 ft (normal load)
    96.94 m / 96.01 m x 14.02 m  x 6.25 m

Armament:
      10 - 6.00" / 152 mm guns (5x2 guns), 108.00lbs / 48.99kg shells, 1910 Model
      Quick firing guns in turrets (on barbettes)
      on side ends, majority forward
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1910 Model
      Anti-aircraft guns in turrets (on barbettes)
      on side, evenly spread, 2 raised mounts
      16 - 1.57" / 40.0 mm guns in one mount, 1.95lbs / 0.89kg shells, 1910 Model
      Anti-aircraft guns in deck mount
      on side aft, 8 raised guns
      16 - 0.79" / 20.0 mm guns in one mount, 0.24lbs / 0.11kg shells, 1910 Model
      Anti-aircraft guns in deck mount
      on side, 12 raised guns
    Weight of broadside 1,371 lbs / 622 kg
    Shells per gun, main battery: 120

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    4.00" / 102 mm    260.00 ft / 79.25 m    10.00 ft / 3.05 m
    Ends:    Unarmoured
      Main Belt covers 127 % of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
        1.00" / 25 mm    260.00 ft / 79.25 m    19.00 ft / 5.79 m

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    4.00" / 102 mm    3.00" / 76 mm        4.00" / 102 mm
    2nd:    1.00" / 25 mm    1.00" / 25 mm        1.00" / 25 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
    Oil fired boilers, steam turbines,
    Direct drive, 2 shafts, 15,138 shp / 11,293 Kw = 22.00 kts
    Range 4,000nm at 15.00 kts
    Bunker at max displacement = 971 tons

Complement:
    265 - 345

Cost:
    £0.357 million / $1.427 million

Distribution of weights at normal displacement:
    Armament: 171 tons, 4.0 %
    Armour: 1,325 tons, 30.8 %
       - Belts: 426 tons, 9.9 %
       - Torpedo bulkhead: 183 tons, 4.3 %
       - Armament: 334 tons, 7.8 %
       - Armour Deck: 359 tons, 8.4 %
       - Conning Tower: 23 tons, 0.5 %
    Machinery: 626 tons, 14.5 %
    Hull, fittings & equipment: 1,455 tons, 33.8 %
    Fuel, ammunition & stores: 723 tons, 16.8 %
    Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      5,321 lbs / 2,413 Kg = 49.3 x 6.0 " / 152 mm shells or 1.5 torpedoes
    Stability (Unstable if below 1.00): 1.03
    Metacentric height 1.7 ft / 0.5 m
    Roll period: 15.0 seconds
    Steadiness    - As gun platform (Average = 50 %): 51 %
            - Recoil effect (Restricted arc if above 1.00): 0.76
    Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
    Hull has a flush deck
    Block coefficient: 0.507
    Length to Beam Ratio: 6.85 : 1
    'Natural speed' for length: 17.75 kts
    Power going to wave formation at top speed: 59 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    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:        20.00 ft / 6.10 m
       - Forecastle (20 %):    14.00 ft / 4.27 m
       - Mid (50 %):        14.00 ft / 4.27 m
       - Quarterdeck (15 %):    14.00 ft / 4.27 m
       - Stern:        14.00 ft / 4.27 m
       - Average freeboard:    14.48 ft / 4.41 m

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 138.2 %
        - Above water (accommodation/working, high = better): 97.7 %
    Waterplane Area: 9,713 Square feet or 902 Square metres
    Displacement factor (Displacement / loading): 109 %
    Structure weight / hull surface area: 88 lbs/sq ft or 428 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0.90
        - Longitudinal: 2.65
        - Overall: 1.00
    Hull space for machinery, storage, compartmentation is cramped
    Room for accommodation and workspaces is adequate