Interesting view from a modern fighter pilot about flying the P51

[SvAF/F16_Goblin]

A Jet Jockey Flies the P-51 Mustang - FLYING Magazine

[Hoss]

Good article, when the fatigue and G's argument comes up again, we can reference this article again.

[357th_KW]

It’s important to note that a number of changes were made to elevator bob weights, elevators themselves and horizontal stabilizers on P-51s, mostly after WWII.  Modern flying Mustangs are very different from war time examples in these factors as well as their Cg’s they operate at.  Modern pilots get a different impression of the aircraft’s characteristics because they are basically flying a different airplane.
 

North American, the USAAF and NACA studied this stuff pretty extensively at the time, and there is really good period test data.  See this thread for a discussion of that stuff.