I might add another tip on the P51 when BnZ'ing a FW.
What I do when attacked by a P51 is start a slow turn, tightening as he gets closer and at the moment he tries to line up a deflection shot, roll 90 pull down then roll another 180 a second later.
This move effectively puts him off target, forcing a flypast where he then often pulls up - he has no choice really.. or he'll be swiss cheese.
I'm then am applying flaps to lineup a quick passing shot.... most times there are no hits, but it's off putting to find your targets tracers whizzing by.
It's a great FW defensive tactic which I sort of worked out and applied a few times online with great success.. The P51 attackers then must have been experienced pilots, as they buggered off after 3 attempts
So when in a P51 be aware that you can be nailed on the flypass by a FW.