Day 15a, Fighting the 190s, for the most part thats about as good as it's going to get with those guys. They are known for NOT engaging hard, more pickers than fighters. At one point in the film you have one closing and your climbing to the left and go into a barrel roll. You need to bring them in closer by tightening your turn before you go into your barrel roll. They were far enough out to see what you were doing and adjust. If you get them in closer, you'll come out of the barrel roll with a good snap shot opportunity.
Day 15b When someone is flying in the same fight as you (Zap) it's good to let them know you are out of ammo and will hang around as a target. If they think you are fighting still they will count on you some what to clear their 6. I know I'd fly different knowing the guy in the area DIDN'T have ammo as apposed to one that did. Merges, you want to merge under, or to the side of the other guy as apposed to over. If you watch the films you get hit more often than not only on the merges where you let the guy fly under your nose. If they are under your nose you can't see them so you can't avoid their shot, nor can you fly to get a better angle, or give them a worst angle. If you must have them pass under you, roll your plane and try to keep them in view so you can either get skinny as they shoot, or maneuver for a better angle.
Day 16a-b The nik fight in the first, you just gave him wayyyyyy to much space. Closing to get a tighter merge woulf have made it much harder for him to get an angle on you and stay tight enough long enough to get the shot. The other was just poor SA. You were in a lot of bad guys and just didn't see the K4 that came around on you. You looked at him once, then got fixated on what was in front of you and he closed for his shot.