Roamer, I have to admit I have not read all the responses so far. I want to address your position to a single CC resist vs 2 CC resists for physical and magical.
Picture an ememy who has 1 magic armor and 99 physical armor (a beefy warrior for example). My party is comprised of magic damage dealers. I am in trouble here.. I cannot effectively magically CC this enemy. He will have a CC resist of 99 percent. Seems odd... the cleche achilles heel of a phsyically imposing, plate wearing warrior is his weakness to magic controlling effects. your system models this backwards. Just my 2 cents.