Just from a mana-efficiency standpoint your bedlam and rune spells are very expensive, so using a stun to channel a nuke/recharm is the better option. Also an enchanter is at his most vulnerable when 1 or both runes are down, for any amount of time. They should be your last line of defense.
So in the example where charm breaks and root breaks on the other mob you can stun > root > other stun > root, and then step back and charm. Also if you're pushing yourself reverse charming you might be in a situation where 3 or more mobs are coming at you and then you will have to stun. Usually stun > AE mez > recast rune(s) because you just got pummeled > root everything and then charm something.
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