Charming Trio was my ls's primary source of income back in the golden days when you could sell the Mann Hands for 1.5-2M. Sadly, those days are very gone...
I agree with the drg-war-whm setup, but I will add a few notes that will give you a lil more survivability:
-whm/smn is a good call, carby provides a little DoT and additional healing support. With a Yag drink, the upkeep doesn't impact your mp overmuch.
-Have the war provoke the big leech going in, and the other two will link on them. The Drg will rapidly take hate away from the war anyway, and then you end up with very manageable rate of damage inflicted on both. If you don't touch the links, they'll stay on the war no matter what.
-No food or buffs for the front line jobs. None, not even protect or an au lait. The leeches will just steal it, and then you've buffed them. Congratulations. Have the melees each buy Hi-Pots for themselves(I like having 3 going into a run) and a Hi-Ether for the whm instead.
Your mileage may vary. I will admit that we ran with ideal race/job combos(mithra drg, galka war, taru whm) and great gear(my drg20 setup is almost the best gil can buy), but using this technique we never lost, and made it out without 2hrs or death the vast majority of the time.