After the application of an inertial elevator to fix the longitudinal instability, the aircraft would have NEAR neutral longitudinal stability.
Before that fix, during the Battle of Britain, Spitfires were longitudinally unstable at normal CG.
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Longitudinally, the aircraft is stable with centre of gravity forward, but is unstable with centre of gravity normal and aft with engine 'OFF' and 'ON'.
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http://www.spitfireperformance.com/k9787-fuel.html
In the game, they are longitudinally stable both static and dynamic:
That is not representative of an early mark Spitfire.