I did my Proving Yourself: Endless Healer (Wave 30) on 4/27/14 and I didn't use any special set for it. Before scalling down I had 9k spirit. I just used spirit flask + ate food that gave me int. I think most people forget about Stance of the Fierce Tiger while in Mistweaver spec. If You have time(allies do not need healing) and there are enemy mobs switch to Stance of the Fierce Tiger and keep stacking your Mana Tea. It won't disappear after switching back to Stance of the Wise Serpent. This was my method so ;-)
