See this: http://forum.topeleven.com/bugs-tech...ing-crazy.html .
Maybe you will notice some similarities (results, match statistics and so on) with your situation. I used good enough tactics too, and I had the quality advantage, and yet I had many poor results. It was as if the game was deliberately penalising my team or the percentage efficiency of my team had been reduced significantly. Weaker opposing teams, using inferior formations, scored many goals way too easily against my team; even a team using a GK as MC scored 2 goals. In many of those situations, the goals came quickly one after the other, that is the time space between them were small. In some highlights, I could clearly see some fishy things going on, for example, suddenly an opposing weaker player became superman and fly through my midfield and defense easily without any resistance from my players at all. In some matches, I could clearly see how the game was setting things up so that the opposing team could score a lot of goals.