Like Batz said, gunnery is different, not to mention people can use flaps and gears earlier than AH. Also, generally, the speeds people are flying in are a bit lower than in AH. So, if you are going for overshoots from 600yards(let's say 600m) in FB or AEP, then I think you're doing it little too early, Urchin. Try to lure them in within 400 meters. You'd be dead if it were AH, but not in FB/AEP.
Also, FB/AEP pilots have a habit of throttling down, momentarily engaging flaps, lowering RPM, etc etc. to saddle behind the enemy perfectly without overshooting - even against better maneuvering planes. That's not such a good idea in AH, but it's generally what happens in FB/AEP. So, you can try something that's pretty hard to work in AH - fake an overshoot move, make the enemy behind you slow down, and then, suddenly go into full acceleration and accelerate away. It works against slower and more maneuverable planes.
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The "insta E loss", is a simple skid maneuver.
The AI usually uses it while going into a Split-S. Simply, pull the tighest split-S, with very low throttle and full rudder input. If the chasing plane is unaware of this fact, he follows the Split-S, gains too much E, and overshoots dumbfoundedly. Used to happen to me all the time, too. Nowadays, I don't need full flaps and air brakes to counter it. I can be gaining on the AI plane, and then see it going into a Split-S. I simply lower throttle, push full rudder, and follow the AI.
