Did you even read the PDF that I posted?
I quote:
Forward center of gravity postitions result in high stabillity and high stick forces; and as the center of gravity is moved aft, these forces become less and less until a center of gravity (called the neutral point) is reached at which no change in force occurs with changes in speed. The stick forces will reverse if the center of gravity continues to move aft and the airplane is then unstable. The neutral point for the P-51B, C and D airplanes is at 28.3% of the m.a.c."
For reference, the article says the test was done with the P-51 at
exactly mid CG.
Mid CG stick forces is measured in the article at 20lbs/g, and in the actual 1944 report, it is at 6.3lbs/g.
The article uses modified aircraft and as such it has no place here and does not prove a thing when it comes to stick forces.
The P-51 had light joystick controls according to the pilot's manual as well as the report that was done with unaltered combat aircraft.
End of discussion, and end of OT.