Update 1.9 is good in that it should give more battle opportunities for the higher arenas but it can also add to the bad matchmaking system.
My fix idea adds 2 simple things. Check teams highest level creature and highest level boost. If other teams highest level creature is greater than 3 levels higher then no match. if other teams highest boost is greater than 2 levels higher then no match. This would not only give more balanced matches but also promote more evenly leveled teams. Comments welcome