FalconSix,
For you info, HTC does model poor fuel and reduced engine performance from it for the Japanese. They don't seem to just go with the top end, ideal aircraft or the Ki-84 would be doing about 370mph on the deck and 425mph at 20,000ft. That is what it was capable of with good maintainance and good fuel, as the tests in the US showed. Instead it does 344mph on the deck and 388mph at 20,000ft. Likewise the Spit XIV has is not modeled with 150 octane fuel, but rather with 100 octane.
EDIT:
The Ta152H-1 only has one known combat encounter that I know of, vs Tempests in a 2v2 which the Ta152's won 2 to 1 IIRC.