The trick here is that the F6F has excellent speed and can nullify that vertical by resetting the fight. Exact breakdown for F6F vs 109s is beyond me, but IdahoBookworm has plenty of examples (dude spams Hellcats and Lightnings): https://www.youtube.com/@IdahoBookworm
Hellcat vs german planes compilation
https://www.youtube.com/watch?v=YviX6d6ZwyE
https://youtu.be/I6ss2_yK910?si=R8MVl6lmtc9npLNR&t=915
https://www.youtube.com/watch?v=JyWTbceZuZs
https://www.youtube.com/watch?v=iettr2Nnd4E
https://www.youtube.com/watch?v=pQZ4FXNaVfg&t=9s
Judging from his footage, he does more than well enough in the Hellcat to qualify it as a menace of dogfighting.
F4U-4 with proper flaps and energy management will beat yak-3 handily without instructor limits.
The yak barely beats it at an extended ratefight but the F4U-4 has incredibly powerful flaps which I don’t yet know how to represent on EM charts. The yak does have the roll rate advantage, so it is a fight that comes down to whoever is more skilled.
Japanese and british planes are an issue if caught on low energy, this I do concede.