How to get S on ARAM map with shaco?

I have many S ranks on many champions, but i still dont understand how to get it. I have read other threads about S rank but on normal maps with many creeps and objectives. In aram it is hard to farm 100+ creeps, not enough objectives, no wards etc. Don't you think it should be tuned somehow? For example i had like 15/1 on jhin or shaco but still A+. Last match on shaco: 20 minute game, 14/1/13 score, 2nd total damage dealt to champions, participate on 2 towers and inhibitor, tried to use any opportunity to bring damage, enemies surrendered - still A+ What to do in ARAM with champions like Shaco to get S rank?
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