This can't be right?

So I just finished a game as Kindred jungle where I went 23/5/17 in 43:19, along with 156 farm (15 marks I'm pretty sure but I don't know if that matters). I was playing with my friend who has level 7 with Kindred and he was convinced that my score was going to be an S, however it was only A+. Now the only thing we can think of is that I was marked down for farm but even still shouldn't that have been worth an S- then? I'm not level 5 with her so its not a big problem for me now but I just cant believe that its harder than that to get an S as Kindred jungle. Does this sound right?
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