Alrighty...
I tend to fly the P-51 differently then others, i will Turn fight P-38's , P47's any Navy Plane, any LW.. etc Without the fear of death, if you know how to use the flaps right.
The only planes that i will actually use my head against are indeed Spits, zekes, Nikis.. These require draining their E and ultimatly killin em. Best method is for a double immelman on the merge against these planes, if your same alt. If you have more alt on em, BnZ'em. Keeping your speed up means, dont pull any sudden moves, try to be gentle on the stick.
I will fly the P-51 at around 10k, enough Alt to run off if i get in a crappy situation, and enough alt to manuvar the plane if i approach any cons that want to fight.
IMO best way to fly a P-51 if you get in a bad situation, lets say if your fighting a Spit and he's close to getting on your 6. Stall fighting, kick in the flaps, 2-3 notches, if you go full flaps you will stall the plane out and crash.
My convergence is set to 250-300-350 from the - Inside to Outside- Guns.
Anymore questions.. Just ask.