Why not make a system that say, you are automatically promoted if your quality is 120+ to prevent tanking ?
I already made a suggestion that no tanking team can develop the players above 120%.
It's more easy for the system to recognize and stop the development of players than recognize and promotes teams above 120%.
Remember that there is a problem also about the top of the server teams.
That will mess more the things.
Also doesn't solve the +1 LV draws.