NACA shows progressive stick travel and elevator force over lift coefficient and normal load. You are directly contradicting NACA. I'd appreciate if you could point out the chart or table you are basing your conclusion on.
Additionally - the Spitfire stability "failed to meet an accepted requirement". This does not make the stability unacceptable. It may seem to be the same for people unfamiliar with testing and test reports, but it is not. In this case the difference is evident from the fact that the Spitfire was accepted into service with 30+ air forces worldwide, among them the USAAF. This would not have happened had the stability been unacceptable.
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