The gravity vs holy trade-off is that Gravity, while lacking additional effects, costs a whole heck of a heap less MP than holy, thus it is more spammy. Meanwhile, after like 5 or 6 holys you're done for a while.
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With AST you have synastry>aspected benefic>swiftcast>Aspected helios>collective unconscious>time dilation on the hots. Nothing else is needed to ehal the tank whilst you gravity spam. The mobs will die before the hots wear off. Next pull is just aspected benefic+helios and gravity soam, but them you have essential dignity and lightspeed to help with the stance dancing healing. Pull after is same as first and so on. You also use LA and celestial opposition during these pulls when needed, and obviously celestial opposition stunns for enough time for more dps or more healing :). Once you get this style of play down right, dpsing on AST becomes incredibly easy.
As for slow on gravity, i am not sure it will be worth it on a spammable skill due to diminishing returns. Its works on shadowflare due to it being a placeable ground aoe.
Isn't Gravity a post lvl 50 skill as well? XD
Poor AST gets shafted on a AoE skill while the other two healers have them eariler. Surprised no one brought this up yet xD
I'd rather have Stella inflict Slow and Gravity inflict... Well, Gravity...
Wish they'd change Celestial Opposition as well... Have it inflict Stop, rather than Stun... That could be interesting IMO, rather than interrupting a cast, for example, you'd just pause it... You wouldn't prevent an AoE from going off, you'd just buy more time for people to dodge it...
And, of course, change Nocturnal Sect... A third rate Adloquium ripoff isn't great... I'd much rather either have Phalanx, or stick to the time theme and have something of a Wildfire mechanic attached to it; It heals, provides a buff, a % of damage taken during that buff gets healed when then buff wears off... There, now Nocturnal Sect actually stacks with Celestial Opposition and Time Dilation... Phalanx is probably easier to balance though, and still stacks well with extending durations...