Overall team % means very little until the margin is greater than 20-25. You might have a team at 100% overall with nearly all 18 - 19 yo players with white skills around 100 -110% and gray around 50% while the opposition might have a 90% overall team with a team of mostly 21 -23 yo players with white skills at around 130 -150 and gray skills around 20. Those high white skills still seem to win an awful lot.