A couple of ideas to help the Eles.
Attunements are meant to be diverse. Staff Water is all about the heals and chill, not damage. The heal skills heal for plenty. Are you packing any healing power? Healing for 5k in an area is huge, and you can combo with Evasive Arcana twice for AoE healing, and ANet has specifically stated they don’t want a support class. Boosting this is overkill, and we become the support class everyone wants.
Meteor Shower is unreliable, and should be more like GW1’s. AoE DoT, but with a meteor shower animation. Boom, suddenly it’s worth using.
I think it would be exceedingly difficult to balance attunments in such a way that we can either swap or not. If you have suggestions here, then feel free to post them. The best you can do is divide up traits in each line – some giving bonuses for sitting in a single attunment, others that promote fast-swapping. The biggest flaw with the entire idea is that if you don’t attunment swap regardless, you’re losing out on 3/4 of your class. Attunements make us versatile, and allows us to continue putting out damage, or CC, or healing continuously – without any pauses. We don’t have downtime like other classes where our CDs are down. That’s a big benefit.