ARAM grading

Can someone pls adjust aram grading, so it's not same as for summoners rift, cause people that only( or mostly) play aram can't get damn chests as no1 ever gets S. Everyone has to die on aram, and minions,well it's like they are not even there,so no matter how good game goes, everyone just gets A,i don't know how good it should end for someone to get S. Can't you just adjust grading with the mode?
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