I thought you did a very nice job. Getting the 2v1 down to a 1v1 makes all the difference in the world and there was only one serious mistake you made. I'll hit that first. This actually had nothing at all to do with the 2v1 since you had already eliminated the P51 but once you got the F4 into a flat scissors at the end you screwed up by motoring away from him rather than continuing the scissors. You had 150-160 mph as he passed off to your left side. If you had reversed immediately and pulled hard into him you probably could have neutralized him as he had more speed, instead, you essentially leveled your wings, he reversed and shot you down. I think maybe you lost sight?
As far as your opponents are concerned, here's what I saw: First, they failed to keep the pressure on you. This is very common in AH (especially it seems with P38s). Your opponents had both E and position advantage on you for almost the entire fight yet failed to press home their advantage. Both opponents extended out beyond 3k on numerous occasions, that's a whole mile. On at least one occasion the Pony extended all the way out to 5k. Essentially, they allowed you alternating 1v1 duels as the other extended too far. What they did well was to stay out of phase. They extended and attacked from different directions. Had they stayed out of phase but kept the fight smaller you would not have had enough time to defend against one without the other being right there to force an immediate defense again and the fight would not have lasted.
As for you, there was the scissors mistake you made which is the only major brain fart. Other than that there were opportunities that you failed to capitalized on. First, as Fugitive mentioned, you should have extended more. Instead, on numerous occasions you turned to place yourself right underneath one of your opponents with no opportunity to get your nose up to him. This is not where you want to be.
Once you defend and the guy extends turn and run out his extended six o'clock. That will maximize your separation from him and force him to turn a full 180 degrees to get his nose back in your direction. By flying directly underneath him all he has to do is point straight down and he can work a pure vertical fight. Sure, you may be doing your best turn rate but all he has to do is roll to negate your turn and keep you in position for an attack. You're pitting your turn rate against his roll rate and you will lose against every airplane in AH if you do this.
If you extend he has a much greater horizontal distance to travel to reach you thus burning more of his E. Expanding on this more, you need to know where each plane is. By extending and placing both opponents behind you, you are putting them in phase and reducing your threat sector. If you can get them into phase, a defense maneuver against one of them is essentially a defensive move against both and it's much easier to keep sight of both which really simplifies the problem.
Most people do not understand this concept well but turning nose on to a guy is not about HOing, it's about taking away angles and neutralizing him. By turning directly into him and taking him close aboard you are eliminating his turning room while maximizing your separation after the merge. You take a high speed opponent 180 out and you know you have a good 10-15 seconds before he will become a threat again letting you deal with the other guy.
For the most part, you did this well but there are a couple of things you could improve on. First, you really need to pass him close aboard, on a couple of these merges you gave your opponent too much turning room. Also, on several occasions you turned nose on way to early (3-4k yds). A guy at 3k yds is not a threat yet (be a different issue if we had Sidewinders). You cut short your extension and helped them to stay out of phase. Use extensions to isolate the threat and build your E while burning theirs. You can then come back nose on to take away their angles followed by another extension.
Another technique you could have used against the F4U when he went vertical over you (and since the Pony was too far to be a factor during a lot of the fight) would be to take the fight vertical yourself. You could have unloaded and extended just a bit as he went up followed by a nose low slicing turn to a position under him. Going nose low in the reverse gives you speed and, instead of turning flat the way you did, dive down under him and then pull straight up for a vertical merge as he comes down. After the merge he would have been below you with you in a good position for a vertical reversal to get inside his turn as he came back up and a possible shot. Mind you, this would not be a good idea had the Pony been where he should have been as a vertical move like that would (should) have made you easy pickings for him.
Overall, very nice fight, hope my critique helps.