Just have to really learn the art of defense ACM if you want to fly something slower than a F16. Getting those reversal shots in the overshoot is a KEY. That is really the only way to defeat these pick and runners. I agree with Fugi. That the more the marrier would create less of that, however, even in huge furballs, like combat challenge, pickers will always be there and will extend out of the furball. I admit to using this strategy sometimes. It's a lot more exhilarating for sure! Always gotta check 6. You might have 3 or 4 on your after a dive in but generally have friendlies to help. It's a blast.
Aircombat strategy is difficult because there is no "wall" to hide behind if someone is shooting. Your only option is to get out of their line of fire and sight. This is the magic trick illusion of your plane getting out of their sites. People will always fly how they want to. Your biggest priorities should be, what planes are I'm fighting against, how many are their where I'm heading, what alt are they, how can I get the advantage on them, which defensive counter maneuver am I going to work with. In the end, the MA is not "real war", its not organized like FSO. It's not meant to be "fair" with regards to planes and setups. The whole point is to grab some balls and get in planes that challenge you and make you better at situational flying. That's all you can do. Then when some P51 speed demon tries to jump you, pull that defensive maneuver and pop them on the overshoot. That's all you can do. Flying at 25K in the same plane ain't gonna work out any different and will probably be more boring. Try to stay away from the gang and drag out the planes to you to even the fight. That's a solid strategy. You will never in the MA be able to outrun 3 p51s and 2 yak3s and 3 La7s chasing you. All you can do is practice defense maneuvers until hopefully your friendlies arrive. That's all you can do.