fd ski,
They are Merlin 66 Spits, so in fairness their high altitude handling will suffer, especially with clipped wings.
Apparently they think the Spitfire LF.Mk IXe could carry eight RPs. I've seen that on Spitfire Mk XIVs, never on IXs.
Initial climb rate on the Fw190 is screwed too, but the P-47 looks OK. Seems M$ is continuing their CFS tradition where they grossly undermodel non-US aircraft. In CFS II that took the method of counting fuel weight in the Japanese aircraft, but not the US aircraft.