In case anyone hasn't seen it, here is the post by dev Dzarn from 2014 saying exactly how AC is calculated. He lists the soft caps and multipliers per class at level 100. Does anyone know, or would it be possible for the devs to tell us, what the caps and multipliers are at 50 and 60?
It's listed in the ACMitigation.txt in your \Daybreak Game Company\Installed Games\EverQuest\Resources directory. The answer is different based off your class. 1=WAR 2=CLR 3=PAL 4=RNG 5=SHD 6=DRU 7=MNK 8=BRD 9=ROG 10=SHM 11=NEC 12=WIZ 13=MAG 14=ENC 15=BST 16=BER