Not quite there yet, but you're well on the way to discovering the fun of "dance parties". Maybe not with three Grave Robbers as such, but equip one with her best move, Lunge. Then add two or three more party members who also move themselves forward (and optionally backwards) with their best attacks.
Grave Robber Lunges then Shadow Fades. Highwayman Duelist Advances then Point Blank Shoots. Shieldbreaker ...well, basically all her skills move her either forward or back. And while less explicitly dancers, the Jester (Dirk Stab/Finale) Crusader (Holy Lance), Man at Arms (Rampart), Hellion (Breakthrough) can also participate in this style of play. It's both very fun, and makes it so that you're far less vulnerable to being surprised by enemies.
But yeah, the boring meta team is "Jestal", Jester and Vestal. Coldly effective but it's just so boring to play. You can easily complete the game with static parties where every member just operates independently, but dance parties and a third type of party, built around using Mark (using 3-4 of Bounty Hunter, Occultist, Hound Master and Arbalest), are great to keep yourself from burning out with the same old strategies.