Next build should fix a bug where PoM was bouncing too many times. We are also continuing to help shift the playstyle towards what's intended, by somewhat nerfing Renew and buffing various other core spells. That does in fact include a cost reduction on Serenity and Sanctify--while those already are rather efficient spells, we want to make sure using them always feels like a strong upside in your rotation, not a marginal efficiency gain. All this said, I want to note that, regardless of where tuning lands on spells like Heal and Flash Heal, the pace will not be as fast the instant- or 1.5s-cast-spamming on live. If your habit is still to always push spells at that speed, it's intended that mana is what forces you out of that (in other words, that you can't sustain it).
