Yes. The higher you shoot from the higher the probability of a kill, but its easier to be beamed if they are low. So shoot high and race under them to hold the lock.
This ties in very well with mig29 characteristics - you can climb and accelerate fantastically well, especially compared to a fully loaded flanker. So if you engage at long range at the same altitude, climb higher than they can, release a GOOD shot (my choice is an ER), then race under them. If they beam while you are still over them lock them up again and you should still be guiding your missile home, since that early it will still be capable of the kill. Also anything they shot at you will be trashed due to your steep dive.
If they are still after you then use your 77s for launch and leave, just make sure you support the missile long enough.
You have to take good shots with the mig as you are limited in your missile numbers!