I have the same problem. I used to score 100+ goals and have 10 goals against me in a season. My efficiency was always above 25%. In competition i have every time close wins, while my team is very much stronger than the other. In champions league my opponent shouldn't have any chance against me but i lost 3-1. I had like 67% possesion but i just cant score. It seems like i cant get my efficiency above 15% while my opponent always have +30% efficiency. I just dont get it. In the cup and cl my team is just big ****...