Need a team for Onslaught S Ranking - is that even possible???

Hey,

Need a team for Onslaught S Ranking - add me KCentra.... not sure how to get this rank... I mean we've had S+ on some rounds but it always adds up to A at the end. Eitherway up for a game

EDIT: Got S+!!! Used this setup in case anyone is interested

http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2594256859/227766351?tab=stats

GL Folks