Leph,
The more I've thought of defensive moves, the more I've come to the conclusion that in order for any of them to work the attacking pilot must screw up. For example a Bf 109G-10 pilot dives long enough for the stick forces to come really heavy. Someone follows you to a dive, you slow down and start a 'split-S', they might end up ripping the wings or overshoots and you recognize it early enough to abort the 'split-S' for a snapshot as they zoom up or something.
If it was clean 1 v. 1 there's nothing that will save you from a higher and faster plane indefinetly. Luckily the arenas are hardly clean 1 v. 1, so IMHO the best you can do is to deny good shot from the enemy long enough to get help from friendly planes or AAA.
// fats