Oh dear, you have yet to know the world. Do you CCed Katie and Leeanne at lv 50?
A solid team would be at least 2 archers, 2 mages, 2 witches, 1-2 soldier, 1-2 heavy armor, 2-3 duelists (princess/valkyrie/bandit), 3 healers. Everyone 50CC50 or more, with 100% affection/trust. But well, I think Liddy can be included in the duelist role now that Kerry isn't free anymore, even with her skill that's not really fited for... Erm, duels.