Level 7 mastery.

I understand that Riot did tweek the ranking system for supports, but it still is almost impossible to get an S on a non fed support. Take for example I just finished a 22 to 41 victory, I myself played Janna and my KDA ended at 2/0/29, I placed 29 wards (almost triple the amount of the enemy teams support) destroyed 6, and healed for over 13k, normal Janna build with frostqueen, sightstone, mobi boots, locket and ardent censer, with only sadly 13 cs, ended that game at 32 minutes at level 15 (laning phase didn't last our highest leveld player was Syndra at 16) and received an S-. Unless my math is off I helped gain 75% of the teams kills, kiting and shielding with all my might (they had a fed Trynd who could kill jinx or Syndra in about 2 aa's) as well as helping take turrets and dragons. I fear what it's going to take for me to get level 7 with one of my favorite supports. That was one of my best Janna games and I'm not sure if I will ever be able to get her to level 7. Yet it took me around 10-15 games to get Sona to level 7 after already having her at level 5. But the majority of those games I had my own fair share of kills. MY friends always tell me that I have to ks to get an S and as a support I feel like that's not right(not that I'm against it, it happens). I just hope Riot continues to work on the mastery system I think its great being able to prove that I'm good with my favorite champions after a clutch save or even a nice clean pick kill because of my positioning.