I am playing a mig29 at 12.7.
Notching and chaff doesn’t work against F16 missiles. You just die every time. Missile explode on airplane, airplane explode. Futile.
Every match has multiple 13.7 planes with fox 3.
Every match has F16.
I have been down tiered one time in like 15 matches.
Unfortunately 12.7 suffers from a terrible matchmaker currently. In that aspect you cannot do much, you pretty much need to accept you will be in a disadvantage on average in 12.7.
However, it is not completely impossible as you make it sound. Notching ARH missiles is not terribly difficult once you learn the trick to them. I suspect you’re failing the angle gating, e.g you’re not moving away from the predicted flight path when you’ve actually successfully notched. See https://youtu.be/LmVO-hBJSWQ