Even after the patch the P-51 won't be able to turn and burn a spit, you've got to fly it with the right tactics. BnZ is the way to go mostly. I really can't wait for the patch. As much as I complain about some of the game's shortcomings, I'm still pumped to get back in the cockpit and light up some german ass with the P-51.
Slightly more on topic: FOZ I think it's great that your doing these tests, keep 'em up, it will be interesting to see if we can find any other quirks in the flight model.