My tip for OI: Set them for individual players instead of asking your assistant in games in which you are the underdog, when I play Manchester United I have RVP, Mata and Pogba (in my save they bought Pogba) set to tight marking, hard tackling... etc, but the other players I consider "average to my team" so I leave them. So to simplify it, only set OI's for players that are better than the average player in your team.