Solid choices, Heolstor is a superb fight, my fave along with libra.
I feel solo is easier, and no preassure about being a good teamate hehe (when it's good it's goood in teams but it gives me some performance anxiety.) I think I will check a guide to learn how to sinergyze with other characters better. my favourites are executor and iron eye..( Dutchess surprised me a lot with how much of a beast she can be, so I wanna learn her better.) how about you?