Anything that would match EP to a 75 will be EP to a 90+, and as such they can still aggro you. One thing I've noticed though some EP/DC mobs will leave you alone if your stats are considerably higher than theirs, at the same time there are mobs that will attack no matter what. I think there are some kinds of hidden behavioral patterens to monsters SE never let us in on, because I can have over 600 attack with a H2H weapon and be left alone, but swap to a club or stave that gives lower attack and I'll get aggro.