Spitfire line

Supermarine Spitfire development was heavily influenced by German Focke Wulf 190 plane - it caused appearance of Spitfires mark IX and XVI - late Merlin powered variants as a stopgap while Rolls Royce Griffon powered variants were being developed.
This shows first problem - Focke Wulf 190 A-1 appears at tier V, and mature version A-5 at tier VI. Spitfire counterpart is Spitfire Mk. V, which in reality had been completely outclassed by Wurgers, and their real counterparts were Spitfires Mk. IX, which are at tier VII.
Another problem is the line ending.
In real life, final incarnation of Supermarine piston powered planes was Supermarine Spiteful, which navalized version was Supermarine Seafang - tier VIII multirole fighter. Before Spiteful, final Spitfire models reached number 24. In game, final Spitfire is Mk. XX at tier VIII.
Instead of Spitfire Mk. I at tier V, Mk. V at VI, Mk. IX at tier VII and Mk. XX at tier VIII it should be like Spitfire Mk. I/V at tier V, Mk. IX/XVI (with bubble canopy) at tier VI, matching Focke Wulf 190 A-5, then Rolls Royce Griffon powered Mk. XIV/24 at tier VII and Supermarine Spiteful at tier VIII.
Then they would match their German counterparts, and line would have more modern look - razorback fuselages would be replaced by bubble canopies, and tier IX Supermarine Attacker (in history it was worse than Gloster Meteor) would share more than just a company name - it utilized Spiteful wings.