For now I'm using Land/Rune, Fort/Dancer, Night/Bushi, Arcanist/Medic, Sniper/Arcanist
Later on I may turn my Sniper into more of a physical/link beast with Sniper/Dancer, but for now my Sniper is used primarily for Criticals, ignoring enemy defense, Binds, and Chase Binds while my Arcanist helps the Night land status effects and assists the Sniper with Chase Binds.
Unfortunately, I've noticed this game has the same issue as the other EOs. That is - after the first stratum or two it becomes much easier. The difficulty just doesn't remain consistent and you get stronger much more quickly than your enemies and the area "tricks" do. I'm glad they did away with the Royal/Prince/Princess from EO3 though, it was just ridiculously unbalanced.