Well, while tying chance CC to armor type is doable....I'd still really just prefer to change the defensive abilities back. Seems like less work and gives player control over how much RNG they want to rely on or if they want to stack the deck in their favor.
Also, the current defensive abilities are just really lackluster and unappealing...I can't imagine when I'd ever really feel inclined to put a point in them and thats a problem; all the abilities should be desirable to all players such that we feel really pressured on level up.
Glad people are considering a combination of systems.