I always seem to get out turned?

[akuma]

Can anyone help me with this, I always seem to come out second best in turning fights.

I understand if you go in full blast WEP on your turning circle will be huge, and I understand that by dropping the power, and adding a touch of rudder you'll turn harder, but I still seem to come off second best as other people seem to maintain better energy and come out inside my turn.

I've seen this when using the same, and different aircraft so its not just a case of X plane has a better turn than Y.

Any ideas?