From what I've seen and flown, the large P-51 are *****cats!
There is a unique P-51 situation though.
It's very sensitive to elevator movement. They fly well with astonishingly little movement.
In my experience, along with this is the requirement to do wheel landings! They bounce badly when a 3-pointer is attempted, or the approach speed gets too low.
This is presuming scale-type flight is on the menu. The Mach 2 P-51s with the 2x recommended motor sizes are a different breed, and need to be treated as highly-loaded racers.. Don't try to float to a landing... the usual cautions for loaded twitchy airplanes.