Hello,
AI F-4Es seemingly refuse to use AIM-7s until they expend their AIM-9s, even if the target is not jamming and at high altitude. I've tried as many parameters as I could think of in the ME, including forcing engagement ranges, changing the aspect of the target, altitude of the target, etc. See the attached mission file for a small test scenario of Two F-4Es against an AI F-15.
TestAI.miz