It's impossible to fix this problem. They can put it harder to "cheaters" but there is nothing that they or us can do...

I was thinking to put "Your opponents will be decided by your highest AvQ in the season" but if you do a season with 1* players then, the next one you buy 5* players and ypu beat everyone very, very easily.

See? There will be always a way to manupulate the draw because there has to be a line. People who manipulates the draw will sell all their players just before arriving to the line...

This is my personal opinion, then you can believe what you want - it's always like this.