AST's weakness in end game

[Miziliti]

Been playing AST for a while. I have no problem healing all the way to Alexander normal and new 60 dungeons. As for ex raid, I don't feel AST is in a good condition. I thought about it many times, and here is my concern.

1. Buff vs. DPS: I'm still in debate with which is more crucial, and I find it hard to actually do both. There's not enough time for me before going back to focus healing. Rng cards often appear to be useless, and my royal road and shuffle is on cd. Without expanded royal road, single card buff feels insignificant in a full party. Sometimes I completely ignore draw to just dps.

2. Cleric Stance back to healing: Ex raid is filled with unavoidable AoE's all the time. WHM can stance dance back for a quick assize, and SCH can dance back for an indomitability. AST have lightspeed for instant cast, but cd is long. I find that I often have less time to dps because I need to turn off stance earlier than the other two healers to counter possible party death by factor in cast time.

3. Collective Unconscious is not useful at all: In order to provide a full duration field, I must not move or cast anything at all or the field goes bye bye. The size is kind of small, tank is often not covered by it at all.

4. Diurnal vs. Nocturnal: Diurnal Aspect bene/helios and regen won't replace each other, but nocturnal field and galvanize will replace each other.

5. Nocturnal makes AST's live extra hard: one thing that makes me comfortable at dps with SCH is eos/selen's help. SCH can pop galvanize, go dps for a while, and not worry about heal. Diurnal Aspect provide regen for me to dps at ease, but I cannot dps in nocturnal without being stressful at fearing co-healer might need help. If I can change sect in mid-battle, nocturnal might have some use.

I really like AST, but AST is in need for some change.