Diving away may equalize your "E", but then your both screaming along close to compression and can't maneuver that well.... and he's still on your 6 ! If he is diving strait down on you (your watching him from your "up" view), he's going for a kill shot, best you can do is roll and point you wing towards him as he goes to guns. This gives him the smallest profile to shoot at. If he doesn't kill you he is going to pass well below you as he tries to pull back up due to all that "E". Go a bit nose low and follow to push the attack, of pick your exit path and run.
Most of these attacks, if done well will have the alt monkey circle until he has you in front of his 3-9 line. He'll then roll into an attack pass from your rear quarter picking an angle that gives him a shot with the least amount of maneuvering. For these, start a slightly nose low turn to either side. Tighten the turn as the enemy closes, how fast depends on how far out he was when you started. What you need to do is be close to blacking out by the time he is 1K out. As he goes to guns, pull up and turn in the opposite direction you were turning.
The tightening turn forces the enemy to turn also to continue for his shot. As you get it close to black out you could force him to shoot in a blackout...which really screws up your aim, or at least puts you under his nose to get the lead he needs for his shot. Once you get use to the "pull up and turn in the opposite direction" maneuver (which he can't see because you are under his nose) you will have a shot opportunity. Murdr use to have a great film showing this move. If you search for it I'm sure you'll find it. Murdrs a bit of a pack rat and doesn't throw stuff away, so I'm sure it's still posted