You forgot flask + food. That's an additional 2600 mana per rapture, when our shaman pops mana tide, I get almost 70-80k mana back. Which puts me at 4.5k positive on average and 50k positive every three minutes. Also mindbender (alone), HoH + Mindbender + Torrent combo, Torrent on cd, and sleeping potions which return 45k mana over 10 seconds which also gives me an additional 27k mana from my inate Mp5.
Also, damage when it appears? We're disc priests, me MITIGATE. PoH right now heals for 25k on average and generates a 20k shield. On five people that's 125k healing + 100k aegis or 225k total healing, that's not including critical strikes or spirit shell. PoH is easily the highest HpM and HpS spell we have. I do see stacking evangelism if there is a fight with very little damage for 5-6 seconds and then using SS with Evangelism but those fights are few and far between. I never said to NOT use penance, I just said that the 4 piece bonus isn't crazy good and that I don't always Penance on CD, especially if there's heavy raid damage which is a lot of the time.