Do you understand that only white skills count?
As shown in another thread - it is easy to have a 2 or 3* player with big white skills, far better than a 7 or 8* 18 year old player.
It is not the overall % that matters. It is the quality of white skills on the players.
It is very possible to make up a 30% difference using well trained players with high white skills.
You probably lost because your opponents players had higher white skills.