Sam +
Whm: Whm ES repose the larger one, 2hr the small one down (obviously 160tp + meditate up before you engage if its first time). Small one should be dead long before the smaller one wakes. Depending on how fast you killed small one and how much mp whm has left can maybe rest a few ticks. Then melee down bigger one (its melee attacks are less dangerous).
Rdm/blm + Smn: Again ES sleep 2 the larger one and grav > chainspell/BP the smaller one down. When big one wakes up can keep it bio/poison to damage it while regaining your mp until 50%, at 50% it will begin to cure V itself so you'll want as much mp as possible to help smn kill it off.
Rdm + Smn is exactly the sam as Rdm solo strat which there are plenty of videos for (a good one is
here