Most times, I see Healers being the Adventurer in need as well. Tanks rotate in at times, but not as often. DPS may get Alliance Raids half the time with some uncommon moments for Guildhest and Trials.

I am inclined to think the off time when no healing happens would be a problem to fix. I am unsure what Astro could have. Sleeve Draw may need to store the extra 2 cards as buffs that automatically slot in when you use a Draw effect rather than just putting no cooldown on the Draw command. Maybe the card buffs can give secondary stats with the Ewer and the Bole being reverted to what they once were. Additionally adding back the Royal Road effects to the Divination cooldown and Seal Combos may work.

Scholars probably just need a few things to add in. These are some ideas I have.

Virus (1 Aether) – Inflicts a DoT on the main target for 30s and spreads to other enemies within 15 yalms at 25 - 50% strength

Osmose (1 Aether) – Inflicts damage to target while restoring mana and fairy gauge

Fairy Pact (Fairy Gauge) – boosts the potency of all offensive spells and weaponskills of the target ally by 20 – 50 while the fairy channels the beam.