The La-5F is a surprise - it seems the additional drag from radial engines carries quite some penalty in this game. And that it does not get near the Spits and Yaks top speed is strange, too.
Im not really surprised about the La-5F. La-5 and La-5FN are both UFOs, but strangely, the F performs worse than the real one up to 4000m*, about 10 km/h too slow @ both 1500 and 2750m.