If you are fighting in the 1-D the most, you want to plan your attack with a safe egress so that you can regain altitude. With altitude you will get your speed back ... very important inorder to stay alive in an F4U.
You can dive in on a target, and turn fight with the 1-D, but too much turning will eventually burn off a lot of speed and at that point you are in deep do-do. If you have gotten to this point and the fight has brought you closer to other fights and/or multiple bogeys, who have altitude, then chances are you will die. This is true for all planes, but the 1-D can't out acclerate a lot of planes.
Watch for enemy planes breaking away from the crowd, manuver so that your attack run is in the opposite direction of the battle and then dive in. If you miss, or turning is going to get you the kill, then extend and start the process over again.
Have you tried the -1 ... great fighting plane. It tends to keep is E better than the -1D and from my perspective, climbs better. If your main objective is to JABO first, fight second, then the -1 only carries one 1K bomb.