Nordeus Cup: what the criteria are established opponents ?

[casper™]

However, the teams top level much higher than ours (I'm level 6 and have been added to the team level 10) have an advantage because their market players are 9 stars (scout 10 stars)

Same here, I'm level 6 and I played today against level 9.

Average quality of the best 14 signed players on your team at the beginning of the season.

Makes any sense what are You saying, because of that I never won any trophy in Cup.