I realize that the P-51 CoG was moved but,

[sniperton]

Originally Posted by horseback

the in cockpit ball needs to be slightly offset to actually be 'right'

Yep, in Yaks where you have to apply a lot of rudder and aileron trim to make the plane fly straight (according to the compass), the ball is considerably offset to the right. In the Italian MC.20X series the ball is slightly off-centered to the right even with neutral trim and flying straight and level. I wonder whether it's realistic.