New fluidity and stimulate exploit

With mechs and lubber (pirates or elementals) in the lobby, it is possible to scale stats exponentially. Put it together with double-header or spells cost one less quest and you are set for instant success or dismay if you are on the receiving end because you can no longer estimate your opponent’s scaling. I would like mechs to compete with murlocs and elementals but this is not the way. What are your experiences and how would you fix ?