Try a real slow and stablized approach and keep a couple of clicks of throttle in until just before the touchdown.

I can't say how a G2 P51 behaves, but for full size high torque/high power tail draggers like the war birds or short moment birds like the Pitts Special, you need to keep the power on and fly it all the way to the ground and do a 3-point (I mean 3 point) landing, or ground loop is sure to follow.