One thing I've noticed in a lot of disciplines, either sports or where you're using a tool.. There's two things, actually:
One - Like I said further above, anytime you're using a tool, the best way to use it is to make it part of your own body. Don't consider it like something foreign and opaque. Pretend it's an extension of your body. e.g. When you're driving a car at full speed, you're part of the car. The tires are the skin of your feet, the chassis is your legs, the engine your muscle. It's the same with planes in this game. Don't think too hard about what to do with these machines. And don't approach them as though you had to fight with them, to get them to do what you want. Just like a good joystick setup, you need to have it so you forget it's there, so you're free to focus on SA. Racing cars, the analog is forgetting (consciously, at least) about the car and focusing on the racing line through the corners, and other cars if there's any.
Similarly, in racing you're always thinking about the next corner, not the one you're in. In dogfighting, IMO, you should be thinking about the next move.
Second - don't be pessimistic. This is something I've seen not just in sports, but in any discipline where you're having to either compete or have to perform at your best. Just thinking positively (and I don't mean faking yourself into this state of mind) makes a very significant difference. Many times I've seen people who could do as well as I was doing... But simply didn't believe they could do it. That undermines what you can do. It's a needless restriction, especially in a game where the worst that could happen is falling off your chair (somehow) - no torn ligaments or flying thru a windshield if you screw up. Often enough... Being in a great mood and a corresponding audacity will break your records and sometimes totally change the way you consider the subject of your efforts.
So don't sweat it if you want to fly really well in this game.. None of the stuff I do is really extraordinary. Most other players could do it too.