Here's your proof. Head on, look up, the best type of shot you can make with a radar missile. You see that all 5 AMRAAMs miss with a 15 chaff bundle (not a lot considering that you evade 5 AMRAAMs). The next track is of the target on the beam, the worst shot you can make with radar missiles, again with 15 chaff or so released. You see 4 out of 5 AMRAAMs track and hit.
Problem with this overperformance in the beam is that if the target pulled any evasive maneuvers on the beam (target in this case is flying straight and level), all 4 of the AMRAAMs would've likely been kinematically defeated. Thus if chaff and evasive maneuvers are combined, the AMRAAM's net PK in LOMAC is zero.
Ten to fifteen chaff would likely allow you to dodge any radar missile without evasive maneuvering. Both the F-15 and Su-27 have over a 100 chaff rounds. You do the math on how many missiles can be dodged without going defensive.
This is V1.12a. The AMRAAM is porked and the R-27ET is overmodelled - get used to the facts. BVR in LOMAC is unrealistic as it is currently. Hopefully this will get fixed in LOBS.
You also have yet to provide proof of the AMRAAM's "horrible" combat record. head on vs. beam.zip