Stay fast, don't climb to reach them and run out of speed.
Fly level, build your speed, once you've got a good head of steam then do a very easy smooth immelman. Most planes will gain 4 - 6k if done right. Regain speed, rinse & repeat. If he dives on you roll inverted & pull back HARD into a split S.
Zoom up on the backside and continue. Once you manage to equalise altitude then he has a choice between between getting very aggressive, or running.
There is nothing like the fight where your opponant starts with all the cards, alt, E, position, and you manage to turn the tables and shoot him down. Those you mark on the calendar so you can remember them.