When the revised F6F was released, the rear views were awful. You could barely see the tips of the horizontal stabilizer. After listening to many complaints (myself included), they adjusted the views substantially by permitting a greater range of motion in the cockpit. A smidge more may be there, but not enough to make a real difference... I fly the F6F on a regular basis and I'm satisfied.
You know, you can always kick left and right rudder to reduce the blind spot looking back....