A few weeks ago, when this thread was churning, I decided to send an inquiry to Steve Hinton, who had graciously responded previously, about a year ago, to an email about P-38 handling.
So here are his comments to my two questions about F4U turning at slow speed, and torque.
The F4U will turn much tighter then the 51 at slow speed. It has very large flaps and has more wing area then the Mustang. The 47 is very heavy and isn't at all good at doing much except diving fast. The 47 requires loads of horse power to maneuver and it won't hold it's energy through many consecutive maneuvers. Torque is more of a concern low and slow flying a Corsair. The Mustang accelerates quite quickly and really isn't much of a bother. I think torque is way over rated these days. It is a factor but easily controlled. Just bring back a little throttle and you are in control again right away.
So, not extremely hard data, but may indicate the AH F4U isn't too far off the mark.
All the best.