For those lamenting the fact that AST has lower base heal potency than the other jobs you're kind of missing something: that lower base potency comes BEFORE the benefit of their stance, and they always have one of the two stances up.

One of the stances adds a free regen to all their heals, the other adds a free barrier to all their heals. Who wants to bet that when you combine the base potencies with the bonuses you get a rough throughput equivalent to the other healers? It would obviously be underpowered if this wasn't the case and SE has generally been pretty good with balance so far.