The excessive anecdotal stuff about the group with which you killed the boss really doesn't add anything to your post.
Yeah, finally after a long time after we did the 25 man version as well, we killed him with:
DK Tank on Sarth ( 44/11/16, which is imo the perfect sarth tanking spec =p )
Warrior tank on Adds
Prot Pally on Blue Drakes
Elemental Shaman ( Healing once Vesperons Acolyte comes up )
We tried quite some time, had some horrible deaths, like pally getting instakilled from the breath and shit, as we used the druid on raid healing...
Eventually we did an attempt without Bloodlust ( we normally use this after we aoe the adds and dps Shadron ), and we managed to get Ahadron down without using Bloodlust, was kind of hectic then as our priest was out of mana, he got a soulstone, went in front of Sartharion, got his by the breath, healed me for 15 more seconds, used his SS, healed more, then 3 adds hitted the druid, but me ( as sarth tank ) taunted 2 while being constnatly on the verge of dying, was very hectic =p.
When Vesperons Acolyte comes up I used:
Anti Magic Shield
Vampiric Blood + HP Trinket + Seed which put me at 42k health
Raise Dead ( saved my ass there =p )
Then Shadron was dead
What we realiesd was, that the fire elementals have little health, around 25k
So next week we will try this with a melee group consisting of 2 tanks, 2.5 healers and 5.5 DPS. We will instantly nuke the fire ellies when they come up. They die so fast single targetted so it's no problem at all, the DK has 2 taunts and the warrior has another taunt, so healers should be fine.
To sum it up, I really like this fight 10man, it actually is a good challenge, the 25 man version isn't even fun, we burn shadron too fast, and the Twilight Torment debuff is easily outhealable. Whilst the 10 man version is alot different, and the funny thing is, we didn't even use Divine Guardian on 10 man, which we have 2 times on 25 man.