Interesting thanks. In my save, 25 matches in the EPL and most teams have scored more than 5 corners. Liverpool scored 10, Aston Villa 8, to name a few. Some teams conceded 13! All in all does not seem too unreasonable. Would like to see stats from throw ins which seem overpowered to me.
The last 6 goals i conceded all came from corners or throw-ins. I have kept default defending set piece routines and let the coach sort it out. did you make any tweaks to yours?