Guys, you are missing the damn point - armor is in the game to REMOVE percentage chance of CC, simply to remove part of RNG. Proposing some superconfusing changes allowing the chance to CC based on armor left is absolutely wrong idea, in that case they could remove armor altogether...

Also, i think that in 90% of the fights, enemies has vastly different armor amounts - mages sometimes have like 20 physical with 100 magical, warriors 150 physical and 40 magical and ranges usually have about 60-60 (same amount on both, but less overall)... Usually just bosses have similar amount of both armors, but even they have some differentiation.