Thunder was removed after 2.1. It was clearly an error. Cleric stance was a "buff/debuff", not an ability dealing damage.
Fluid aura: I forgot this spell. it was a 150atk, 5yalm range with 30s cd and a very boring pushback. Even if you think it was good (a free attack) it required to go in melee range. Situational.
The cross class: probably you don't remember anymore because 10 years are gone or you weren't with us, but the 5 abilities taken were all debuff (like eye x eye) + swiftcast-surecast or something to improve your defense.
In short: as White Mage I used stone, and sparingly, because MP management was an issue.
Let's return on topic. If you write "because you can use this and that..." well, this means lily aren't enough anymore and this is exactly what I wrote.
In DT we are forced to use EVERY ability we got, and do not waste them. As you wrote you need 2-3 different abilities or you fail.
Anyway:
Lily + PI << Cure III + PI;
Asylum right now is bad. SE should add duration time OR (even better) potency (100->150/200).
Don't get the thin air. Maybe you meant swiftcast?