Looking at those datamined spell stats, it seems AST will be the worst healers damage wise, which I find slightly annoying for leveling. You can't rely on cards to make up the difference since most of them don't actually increase damage and you pretty much do less damage than WHM at all levels, which was already kinda crappy. Not the end of the world but the class seems to be heavily balanced around having the card support aspect benefit group members to balance it out, as both their heals and damage is lower than the other healers(not by a lot, but still). I'll miss my SCH leveling, guess I'll really have to spam them dungeons.