Tank needs to rotate mitigation abilities for mountain buster. Don't do DF. Do it through a shout group and do x2 whm, sch, x4 dps (one single target at least and a brd) and a pld. Tank needs to be topped off/shield every mountain buster. Brd needs to keep rain of death debuff up. Apply virus if you have it. Everyone needs to know the pattern of titan's abilities. Open a web page with them listed if you have to or write them down. The only damage anyone should take after the heart is from tumult and maybe a bury here and there. Post heart is all about dodging and not being a hero with dps. Once you have his pattern down and people can play their job decent the fight is very easy. For me, getting healers that could do their job was the hardest part. The brd doing rain of death is really important too. -10% damage on a 4k ability is huge. For plumes you should be moving before they pop, not as they pop.