Here is the data on the F4U-1 and others. Hopefully this will clarify things. It's pretty "cut and dry" that it is now way under modeled in the sim.
http://www.wwiiaircraftperformance.o...4u-1-02334.pdf
http://www.wwiiaircraftperformance.o...f4u-1d-acp.pdf
The whole article for all the Corsairs:
http://www.wwiiaircraftperformance.org/f4u/f4u.html
Pretty much every other airplane:
http://www.wwiiaircraftperformance.org/