They worked fine for me.
A couple points as I go through them. You fight a furball like your in a 1 vs 1. You might get a guy to fight with you but if he is doing it right he is just going after a target of opportunity, which how you should be fighting as well.
Most of your shots are from too far out, the first pass in the F4 in the "spit_1" film you had the right lead, but then dropped off your pull so you only got the one hit sprit.
In a furball, like all those films, you should be spending more time looking for guy trying to saddle up on you than looking at the guy you are chasing. Furballs are for picking. Make a pass on a guy, and then go to the next guy you can get to with out burning E. When following a guy who is chasing a friendly you have the advantage, they are going to follow your friendly, makes it much easier to get ahead of their maneuver and set up a nice shot.
When following a guy use more lead pursuit. try to keep your nose a bit ahead of where the other guy is going to try and cut inside his turn. Also dont be afraid to chop your throttle to get to a better corning speed to make your turn a bit tighter than some of those faster poorer turning planes.
These are a few things I see, take it with a grain of salt. I watch them some more and see if I spot anything else.