I am inclined to agree with the OP on buffs. The cleric should help setup the chanter for success with buffs.
Beyond that chanter should cc and not take damage. If chanter is pulling aggro the. They are inefficiently burning he cleric's mana. Beyond charm chanters also have stuns, roots, memory blurs and lulls to manage mobs. Add rune on top if that and if playing well, you should not take more damage than you can regenerate naturally. It's a tall order, but that is how to play a chanter effectively. If others are breaking mez then you are a bit more limited by the spontaneity.
Not nocking you op, just pointing out that a well played chanter should not take much damage and by extension not need hp buffs though it is certainly comforting to have them. On the other hand I cannot see why the cleric wouldn't buff you if asked.
I think outside of chanters the best cc is done by paladins/rangers because they can rip aggro easily and park things away from the party. The best I ever see from a cleric/Druid is rooting the dumb things in a big melee eating mass. That I would take to be because they are maintaining a baseline of mana for when the proverbial poo hits the fan ^^
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