I guess I just dislike the idea of major "your hard CC was resisted by 1% chance" swings. So it'd be nice to have some way of applying guaranteed CC. Your health idea sounds nice. I guess no way to show final chance to CC in game until they release the editor? Would be useful since your formula is fairly complicated.
Is there currently a way to add new talents? Something like "30% of your damage is piercing" would go a long way in solving the problem with mixed physical and magical damage groups.