My OT keep taking my Aggro

[Viridiana]

let him die if he cant watch his aggro

Because tank deaths in Ultima Hard are totally easy to recover from as a raid and don't drain healer resources or anything. Oh, wait, no, tank deaths in that fight are potentially catastrophic depending on their timing. I'd understand if we were talking a DPS: we're expendable for the most part and need to be put in our place on occasion. Raising a DD has a time limit of "whenever I feel like it." Raising a tank in UH has a time limit of "before the good tank hits 5 stacks." Or worse, "before the next set of orbs." I'd rather the tanks not be suicidal/homicidal and out to get each other.

[Kelberos]

Yeah - the bloodlust can sometimes get to some tanks and they forgot why they are there.

I generally just shrug it off and hit the target with BB combos over and over. I will even sacrifice SE and SP combos if i know the OT is 1 combo away from stealing aggro. I figured the healers can take the slight increase in damage taken - or ill pop a cooldown to compensate. You can generally blow past them quite easily if you pop a cooldown or two.

[Maelwys]

In turn 2 I notice it a lot with PUG groups the other tank vokes and starts to get three stacks then when I voke and do my combo they flash spirits withing and circle fo scorn pretty much taking hate back and now I have no voke or other cooldowns, they get to 5 stacks then die. The worst is people getting buffs and having abilities to lower hate and not using them. Like taking the path so Tanks deal less slashing damage but DRG and bard and BLM are solid yet no one uses repelling strikes or evasive jump. Not an issue anymore as I am better geared now but 1st time in coil it was very annoying.

The aggro generation point isn't too much of an issue any more (the patch boosted enmity gain in Defiance and Shield Oath by a ridiculous amount. I never lose hate on Turn 4 pulls these days let alone T2) but prompt Tankswaps do seem to be an issue for a lot of people in PUGs.

It takes a little bit of co-operation from both tanks, but the general idea is to have Step 3 or Step 2+3 of your enmity combo queued up and ready to use immediately after the Provoke. Using Provoke will put the new tank at one point of enmity over the old tank... this can be overcome if the old tank autoattacks let alone uses a weaponskill, so following up the Provoke with a pre-prepared enmity combo ability spikes the new tank's hate levels up a lot higher. As soon as the old tank sees the Provoke go off, they should STOP using combos and turn away from the boss (a mistimed autoattack can pull hate) until the new tank secures enmity by using a weaponskill or two.

For a PLD there are two schools of thought on the best combo to prepare for the swap:

(i) Use 'Fast Blade' and 'Savage Blade', THEN Provoke, THEN 'Rage of Halone'.
This gives you a large enmity spike over the other Tank in one GCD... However the animation of RoH is quite long, so the enmity spike takes longer to kick in.

(ii) Use 'Fast Blade', THEN Provoke, THEN 'Savage Blade' and 'Rage of Halone'.
This has two advantages: it is very easy to keep prepared prior to a tank swap (just spam FB), and the animation of SB is a lot faster than RoH so the enmity spike kicks in sooner. The downside is that SB pulls less hate in one GCD than RoH does, so in certain circumstances hate might "ping-pong" a little between you and the old tank after you use SB until you get a followup RoH off.

At endgame, some Bosses such as EM Ifrit or Turn 2 ADS have nasty cone abilities - so careful positioning can also play a big part of the tankswap. During such a swap, both Tanks will often strafe around a mob whilst attempting to stay at least 90 degrees apart; and any melee DDs will stay at 180 degrees to the "Main" Tank's designated tanking spot. Since most Cones are 90 degrees, this means that only one tank at a time should be getting hit by the boss, and the melee DDs should stay totally safe. (example of an anticlockwise swap: MT tanks Boss at 12 O'clock, DDs and OT are at 6 O'clock. OT moves to 3 O'clock and Provokes. MT moves to 9 O'clock and OT moves to 12 O'clock. When OT has secured hate, MT moves to 6 o'clock to join DDs.)

[Cligue]

When I am about to swap hate to the other tank I will stop all of my dps about 3 seconds before he provokes, let him get hate then switch to sword oath and wait about 10 seconds before doing anything else. This gives the other tank time to build up a good hate lead on me so I can then contribute as much dps as possible. If you are not in voice coms with the other tank use macros with sounds ie. provoking in 3!! <se.1>
And let the other tank know before you start the fight that he needs to stop all dps when he sees that and to not start back up dps till about 10 seconds after you have hate.

Big thing That can mess up tank swaps is having to dodge an aoe as the mt right after you got hate. If the ot does not and is still dpsing he will pull hate, that is why the fail proof way is to just have him sit there for 10 seconds after swap.

[Maelwys]

Big thing That can mess up tank swaps is having to dodge an aoe as the mt right after you got hate. If the ot does not and is still dpsing he will pull hate, that is why the fail proof way is to just have him sit there for 10 seconds after swap.

That seems like overkill to me.

I can't think of many circumstances in the game where dodging a Boss ability would make a Main Tank have to run so far away that they couldn't just keep using Melee weaponskills.
I can think of even less circumstances where a MT would have to dodge such a distance and an OT wouldn't.

Furthermore, most endgame fights are heavily scripted and predictable... so non-emergency tank swaps should nearly always be timed so that they DON'T coincide with any dodgeable AoE attacks.

You're right that stopping all DPS for a period both before and after a Provoke would be almost foolproof (in terms of enmity trading between the two tanks) but ~13 seconds of the "Original" Tank contributing no DPS at all seems a little bit overkill to me. Particularly for fights with DPS checks - WARs and PLDs both have a good deal of Spike DPS they can throw at a Nail, a Gaol or a Conflag. Though I suppose you could just use that period of downtime to spam Stoneskin on everyone...

[Cligue]

Sorry let me be more clear, you can stoneskin nstuff I was just saying do not dps, this is more for playing with randoms btw when you might be i90 and the other tank i75.

I know tanking fights that I am way overgeared for even after 10 seconds of down time I have come close to pulling hate back and had to stop again. Like everything in game situation dictates your actions. And most dps checks in the game are actually not on the boss but adds/objects where hate does not matter, so the ot can always go hard.

[Soulburn32]

1. If your in OT position alternating between Riot Blade and full Halone combos is normally enough to never pull aggro. 2 Riot combos for everyone 1 full Halone is enough to keep the STR debuff up and never pull hate.
2. If your about to swap out in the next few seconds as the MT stop doing full BB or RoH combos. If you switch into Riot or Storms Combos for 1-2 cycles as your about to swap there will never be a hate issue.