I make no claims to have data to back it up. I've never flown a P51 for real.
What I do know is having flown it a bunch lately in the MA and it some scenario bits, it does everything that I've ever read by wartime Mustang pilots. If you get too slow, it gets sloppy. But it turn fights well if you fight at the speeds that it turns best, and use a bit of flap now and then. It has the speed to get you out of trouble, and it has the range to go a long way. It fights well up high, and can knife fight down low.
Not sure what else you want from it. All I know for sure is it lets my cartoon pilot and my imagination pretend I'm a WW2 Mustang driver when I fly it which is all I ask for.