Tonberry King strategies?

[Aggronaught]

depends on the group make up really, have been doing this dungeon since I hit 50 with no issues with "lack" of dps.

if I get 1 ranged 1 melee, the range goes out and kills 3 adds(I only had 4.2k or so hp when I started so taking 4 was risky) and gets on the boss till he casts everybody's grudge and then gets back on to killing 3 more adds..rinse and repeat.
You can really kill all adds till about 4th rotation like this because only two adds would've spawned before the first cast, and 3 adds each before 2nd and 3rd.
I tell the melee to take LB at around 30% and the range to ignore adds around 40%, while I kite. (Only reason I don't start kiting at 100% is due to melee positional requirement)

If you get 2 ranged or overgeared dps, you can kite the adds endlessly as a tank. You can also AOE LB in the middle and immune the dmg as paladin with however many adds.
PS: DPS kiting is the worse advice I can give, they usually end up dying, its better not to touch adds and let tank kite.