I'm by no means an expert and I only fly the P38 but I looked at your film. I don't mean to offend you in anyway but here is my opinion of the fight;
You made some critical mistakes, most notably diving on a La7 that was much lower than the 205. This 205 easily converted to your 6 because your E states were much more similar. The La7 did what alot of La7s do- ran and left his buddy. At this point the La7 was out of the fight.
However, you countered this by turning horizontal keeping the 205 just out of range. As he got within 900 you did a beautiful 'rope' (he followed you up), the 205 stalled out and at this point you should of put your nose down and killed him. What I mean, is you should of rolled the plane to where you were inverted and pulled down to him, rather than pulling a horizontal turn where he was at your 9 o'clock. It was a beautiful rope, it was a shame you didn't take advantage of it.
Then, you moved almost 3k away from the 205 and instead of making him climb to you, you went right for his nose throwing away your altitude advantage and gave him a head on pass opportunity. If you had gone vertical, you may of roped him again or at least would of have defeated his face shot.
Now the Mossie joins the fight, you defeat the head on shot by the Mossie but it places you away from converting to the 205's 6 o'clock because you extended it long after the Mossie went by. You further place yourself at a disadvantage with the 205 by concentrating on the Mossie.
I would of stayed with the 205, because the Mossie would of been unlikely to have gotten a good shot in a turn fight, while the 205 was far more likely. Not to mention, you had a slight angle on the 205 as he did a vertical manuver that invited a lead turn (turning slightly early) because he could not get his nose on you and the Mossie was already past.
After this, the 205 is easily able to stay behind you (more so after a vertical manuver that closes the distance between you) and the Mossie is having difficulty even staying behind with the evasives.
I know there are gents alot more knowledgeable than I, but thats my take on the situation.
It takes alot of time to learn ACM (more so if this is your first flight sim) but keep in mind its not something that stays fresh unless you work at it. The fact that you're looking at films and accepting criticism is a good way to start to really improve. Keep your spririts up!
