I realize that everyone and their pet hamster is posting this type of thing, but I think I've got some cool ideas. Might be worth a read for fun at least.

In my 'expert' opinion as an indie game dev who has shipped over 100 copies of a meh puzzle game, here's what I would do to the AST.

Problem
AST healing output has been reported to be lower than the other healing jobs. I believe taking the time to draw cards rather than heal is not helping this. Yes it is off the global cooldown, but there is still some time lost in animation/input time/decision making. Perhaps marginal, but not zero.

Solution
New Trait
"Read the Stars"
Using the draw command will call down a star from the heavens. The star will land on the party member with the lowest health, healing them X potency. If cleric stance is active, the star will instead crash into a random enemy that you are in combat with, dealing X potency damage.