Like Phil advised, the cup draw is based on top 14 players. Since your team average is ard 6 stars, you will definitely be drawn against 1-3 levels higher than yours. Yes, it was a big disadvantage. But that's how it works.

There's always pro & con.
1/ If your team is super strong like it's currently is at the beginning of the season, you are more or less guaranteed for League & CL. But you have almost no chance for the cup.
2/ If you want to almost guarantee for the cup, you should have your top 14 players around 3-4 stars at the last day of the previous season. But then against you risk losing League & CL if you don't buy enough players for the new season. Even if you do, you will need to spend more tokens.
3/ If you want to have a balanced chances for all League, CL, Cup & without spending a lot of tokens, you should have a team of mixtures of 3-6 stars players so that your average quality ard 3-4 stars.
4/ If you want to guarantee for all & have loads of tokens to spend, sell all high quality players & buy 3 stars players at the end of the season. When starting of the new season, start to replace the low quality players by 5 stars.

So it all depends on personal preference.