I dont really think that changes are needed, yes AoE dps skill for AST comes late, but if you look for example at level 40~ what skills AST has access to and for example WHM, you will see that AST in low levels is actually the most powerful healer with their own medica II early at 40, essential dignity at low levels, light speed, lower mana costs, luminous aether appearing at very low levels + buffs from lvl 30.
We might be getting some things late, but we have buffs that can icrease dps that other players do.

It would be nice to have some little effect tied to gravity, even if its heavy, but i dont think it really is needed for the utility that AST provides with cards(or posibility of utility if we talk about rng). i never had problems in dungeons.