There is no need for more aoe healing skill...
Because it would copy assize or indom or cure 3... Which is useless for the AST...

Ast have already a lower mp cost which help a lot
And lightspeed for emergency burst with reduced cost

On A1S a simple aspected helios is enough to cover any aoe damage (aka gunnery pod)

The only heavy aoe is the double gunnery pod at the end of the first phase (use lightspeed and it's a piece of cake)
And each double landing...
Again on this on aspected helios must be up and use collective unconscious
Then just use celestial opposition and go dancing around XD

A1S is almost too easy as Ast