Ok, that's enough of your little emo bitchfest... Time to rerail this shit, well sorta...
We have allready discussed the convetional methods of damaging the wyrms. I'd like to ask your opinions on something that's a little bit more outside the box.
My first question is this. For Tiamat and Jormy, would it be possible to do a melee burn kirin style zerg rush while it's on the ground? With proper support i think it's possible...
Here is what I'm thinking. Main tanks are uber hate mongers such as NIN/BRD and/or BRD/NIN (I checked some of the resist builds out there and BRD can wear pretty much everything NIN can). With rock solid hate, just toss your melee at the wyrm's fat ass while it's on the ground. Abilities such as feint, angon, frightfull roar, perhaps even dia 3 could all be used strategically to weaken the mob's melee defence. Basically, the melee TP up on the wyrm and unload SA WS before it takes flight.
Once it's in the air, the melee all logout to reset hate (or simply step back out of AoE range if they still have TP) and are replaced by BLMs and RNGs in order to keep the damage output up and to counter regen. Note that BLUs can dps full time both on the ground and in the air. Once it enters the ~20% hp rage mode you could just setup a CS Stun order to counter the TP spam (it won't really spam that much more since you've been feeding it tp the whole fight anyways), wait for it to land and have your heavy melee (DRK, MNK, WAR and so on) unleash the fury!
I highly doubt this is the most efficient method of killing these HNM, but I think it would be something fun and exciting to attempt. I'm also willing to be you could down the wyrms much much more quickly in this manner.