You dont have to worry about that, my case is diferent. It doesnt make my team stronger because I repeat level, cause we are all repeating levels, there is just not enough teams promoted to level 85 to make leagues.
The worst scenario is to play 1 or 2 levels lower than highest level. This season that levels are 83 and 82, they have to play Cup, CL and SL with level 84, that really sucks. I was there, I know how is hard to win Cup if you are playing 2 levels higher levels that are repeating levels (every 3-4 seasons). I had that problem from level 1 to level 53. So I won my first Cup at level 53 (my first season at highest level), it was impossible to win Cup before that cause I was playing constantlly against teams +200%.