Maybe it has something to do with attending the match? At the end of the previous season I watched the games with much lower % teams and I lost 2, draw 2 and won only 1.
So I didn't wanted to waste my team watching the games anymore and to my surprise...I won the next 5-6 games against lower quality teams ( by 5-0, 7-1 etc ) and also against much stronger teams. ( Best win was 2-0 against 121% team, I was 100% )...