One of the things you might try is to go to 1 Second timing during Air to Air engagements, as this gives you more time to react to enemy launches. As soon as you see their launch, do the "turn and burn" at whatever altitude you're at. Sometimes, changing altitude continually during the run for your life seems to help.
Of course, the best thing is to be able to outrange your enemy. If you do, fire at the outside range of his missiles, then turn and run. If you don't, try dancing around on the edge of his outer range. If you can force him to fire off his longer ranged missiles and you can outrun them, he will be vulnerable to your counterstrike.