Okay this what I found works.
Put Johnny who's a tank in front where he'll take all the damage
Next is Giovanni , the reason you want him is that his flask attack poisons enemies and acts like a mine when the foe falls.
Finally in the rear is Dahlia, her rapid 3 shot spread will literally shread though anything in your wa.
Thumbs up if this helped
Great game my only complaints are the times it takes to build up the hobbies and that Quill's preferred stat is the last one so she takes ages to gain affection compared to the other girls
you must press space to use sniper scope