Jungle Volibear Mastery Tokens are Insanely Hard to Get

Now, I'm mid gold. Nothing special or exceptional about my skill. Volibear is my go-to jungler, and by miles my best. If and when I do manage to carry a game, its probably because i'm playing Voli. I've never managed to get better than an A+ on him. He's my most played, and while my win rate isn't crazy, it is over 60%. I've had more deathless, hard-carrying games on him than any other champion. But for the life of me I can never get an S of any kind. The screenshot is possibly the best Voli game I've ever had, period. My farm is so low only because I was busy participating in 89% of my team's kills. I even managed to solo contest a baron attempt, get a couple people killed, and live to tell about it. So I can't help but wonder if maybe the algorithm is a bit skewed for determining the grade. If anyone can show me some Gold or higher ranked jungle Volibear games where they got some kind of S grade, I'd be interested to see what it takes.

Sorry for the long post. /Rant over