I did mine about a week ago following http://howtopriest.com/viewtopic.php?f=13&t=4627
I regemmed all my gear focusing on spirit, Int and mastery. I was at about 23k spell power (with Fire up and food/flask) and 10k spirit and 30% mastery. I found mastery better than crit, more reliable here.
For glyphs I used POM, Binding Heal and either Smite or Weakened Soul, cant remember the 3rd. Talents went Solace, DP, Twist and Star.
I found using Fear and Psyfiend didn't matter much as they broke instantly, I eventually stopped trying.
X2 Wait for SS a few seconds, get a shield on tank, POM, Penn and Sol before you cast it. The first few get interrupted.
X4 to deal with both dispels, if it was on the Mage, LoF him out and move away, shield him and let it blow up (this only works after the first add is dead). If its on the hunter or you, shield and let it blow up. BH works good for when you get it after it blows. If both are in melee, I just used a Mass Dispel. Healing the 2-3 targets after one blew up eats just as much mana most of the time. Never LoF the rogue or Warrior here, they just Charge/Shadowstep back in, mage will go back in too if all 3 adds are up still. Pain Sup Early so its up when you need it for the next wave.
For me, waves X5 were the trickiest and gave me the most issues, mostly stemming from my luck of the hunter always getting the first Chomp and he refuses to get under barrier during the AoE. AoE + Chomp made getting the hunter up a pain while dealing with the tank damage from the enraged adds. I started using Voidshift on the hunter in this case and DP/HS/Binding Heal the tank. If it wasn't the hunter it wasn't that bad to deal with the chomp due to Barrier keeping SS up much longer. Always save Barrier for the enraged add.
X7 start with Shield/POM tank then go into SS. Pop Pain Sup during enraged adds.
X9 Pop SS when you start the phase, the AoE mob is up awhile. Barrier as well here.
They target whomever will get chomp while they cast their burrowing animation, watch for it and shield that person, they usually wont even get the debuff. Otherwise with POM glyphed, its a pretty good single heal for the first jump. i used it a lot to get rid of chomps if the CD was up at the right time. Penance is another great option. If neither were up, I would shield and wait for one. If it ended up on the tank, used shields, Penance and POM, I believe a few times I went as far as Focus/Flash heals to get it off.
I used the following CDs and cheat sheet with Shadowfiend on 2 (after SS went out) 5 with Hymn when only the big guy was left and 9 at the start.
2 Barrier & SS - AOE
3 - CHOMP
4 Pain Sup - DOUBLE DISPEL
5 Barrier & Void & SS - CHOMP/AOE
6 - CHOMP
7 Pain Sup & SS - AOE
9 Barrier & SS - CHOMP/AOE
10 Pain Sup