S on 'unusual' support

Did someone already get an S with a malphite, or another unusual support ? Even with a very good game (2/0/8 win in 20 minutes) , i get an A. Maybe RITO expect to see malphite top and not support and so 40 is a low number of creeps ? Am i supposed to take the farm ? I am confused about how to improve this mark ... #BUG_SPOTTED Perplexedly yours,
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