I've heard/read many things about CHA gear affecting charm, however all of them agree that more charisma equates to a better chance to have a successful charm. As for duration, well, I'm not sure if the tick checks are against MR/CHA or just MR etc, but for landing a charm charisma is vital.
If you were solo-charming as an enchanter I'd say keep an even balance of int/cha gear, but since you have heals etc, the "OH SHIT CHARM BROKE" moments won't be as risky or mana-intensive, so it may pay off to push charisma more.
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