[Messianic]

I was part of a good SF AE group at 53 - but yes, ideally you're 56 because you get your second jyll's spell at that point and can alternate between the two (recast timers). Also, the mana pool difference b/w 53 and 56 is helpful.

However, I'd say it's far more important for your chanters to be higher level since stun resists are more devastating than pbaoe resists...