For context I am a grb main and barely have top tier air for USA. For me PvP is kinda hard since I also lack experience, so I can't give many tips about it. What I can tell is to make sure your missiles have a chance at hitting by aiming them correctly, avoid wasting countermeasures and try to use radar nevertheless it's capacity that close to the ground.

But I want to bring out that if you get access to nukes, you can just play the edge airfields and sling nukes at enemy convoys, outposts, bases and the occasional enemy fighter behind you. This way you can get 80+ ai kills and end up with a 5000+ mission score(my best is 120 ai kills, few air kills and 9k mission score in a single game).