Tips on how to beat Titan HM with DF

[YanDere]

Healers should dps for most of heart phase too.

Not really required, maybe you can do SCH dpsing and WHM healing, but all healers dpsing is really a bad idea. At least one healer has to focus on healing, because in p4 you receive a lot more damage than p1-3.
And for the weapon, healers can do it with GC weapon, even if a ilv70 one would really raise the success rate, and dps just can't make it in GC gear, they need to deal damage. I've beaten the p4 without LBing with a WAR OT and 4 dps all in ilv70 weapon, even if I wiped a few times before getting it right.
The MT doesn't need a good weapon, he's just there to distract the boss.

[Raenryong]

Not really required, maybe you can do SCH dpsing and WHM healing, but all healers dpsing is really a bad idea. At least one healer has to focus on healing, because in p4 you receive a lot more damage than p1-3.
And for the weapon, healers can do it with GC weapon, even if a ilv70 one would really raise the success rate, and dps just can't make it in GC gear, they need to deal damage. I've beaten the p4 without LBing with a WAR OT and 4 dps all in ilv70 weapon, even if I wiped a few times before getting it right.
The MT doesn't need a good weapon, he's just there to distract the boss.

Stick a DS Medica(2) and Regen on the tank at the start of heart, and then DPS until you see Weights. After Weight, top people off, cure through Tumult, top off/regen tank and DPS again. The outgoing damage in p4 is low.