Hello
Thing u can remove essence font from your bars. It drain u from mana very fast and ist not very efective in my opinion. Try talent that reduce mana cost of vivify and enveloping mists, and just rotate this two spells. Put Enveloping mists to tank wha have agro and then use vivify to heal the raid. Dont take mana tea as 110 talent, try to use thunder focu tea insteed, instant enveloping mist is life saving spell and then u can use free vivify. just use your thunder focus tea on CD. I use this strat and i dont run out of mana. And in that log that you post, i can see only one dead, this is thing what you have to learn, how boss fights work and what you can do in fight.