Kinda new, most effective thing I've tried on my own is:
1. Flaps down
2. 180 degree roll
3. Pull back on throttle until pointed downwards
4. Full throttle
5. Pull slightly up the further you go down until your horizontal just above ground level.
6. Flaps up
1. Your speed and head start should keep far enough ahead of your opponent that making a sucessful shot should be extremely unlikely.
2. Once at ground level your proximity to the ground is a hazard to higher altitude enemies attempting to line up a shot.
3. Once your opponent lines up with the ground to attempt another salvo you can put flaps back down and make a series of tight vertical loops to get behind him and possibly make him stall out to hit the water.
lol. so don't bother with trying to get behind him and shoot, just dodge dip dive duck and dodge, hoping that he will run into the ground?