Hermes is useless other than as Wind filler. Zephyrus will strongly benefit your group if you don't have Sol.
Since you have Gaia and Jeanne you could have Guard up for every overdrive (as long as you don't eat 2 ragings in a row). If your debuffs land you'll be in good shape.
The group I plan to use is: Mordred (wind, EX: -20% DEF DWN), Gaia, Heimdalr, Raphael, Sol. That gives me 2 dizzies, 20% off the rage meter, -1 to the overdrive gauge every 6 turns, -40% damage to the first raging overdrive each cycle, -45% ATK DWN, -30% DEF DWN, and Mordred's full complement of abilities (all extremely useful and non-redundant in this group).