Can I ever get an S on Support Leona in Ranked 3's?

What does it take to get an S on Leona Support in Ranked 3's? I need it to progress my Champion to the next level - just had a 5/0/10 game and only got an A. Only 82 minions killed but 10.3k gold earned (just 1k below our solo top lane and just over the 9.9k of their AP carry in our lane). We won... there were 20 kills so I participated in 75% of them... what else can I do or what is the threshold or main contributing factors? Has anyone here got an S on Support Leona in Ranked 3's, what was your score? Thanks in advance for any advice!

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