I never used the Item Dupe or JP Glitch, and my party is awesome:

Ramza LV85 Brave97 Faith70 Ninja w/ Squire skillset
Cloud LV84 Brave75 Faith40 Default w/ Item command
Female Calculator LV77 Brave45 Faith80 w/ every ability
Male Monk LV80 Brave80 Faith45 w/ Item command
Female Summoner LV74 Brave31 Faith94 w/ White Mage skillset