CS counts too hard towards Grades in ARAM and RGMs

In Summoner's Rift, farming is incredibly important and it's something that a big part of the game is focused on. It's only natural that it is a significant factor when calculating grades.

In game modes like ARAM and Hexakill, where you are laning with multiple members together, I feel like the Grade system is too much skewed towards the player that gets the farm. Not only will he perform better because he has more gold, but also the CS score on it's own is a huge factor independant of gold-gain. When I pick up the Coin in ARAM and I end the game 3/1/13 with 1 CS because I have the f*cking coin so I'm not supposed to be farming, the game says that I've performed poorly and gives A-, a grade that you can easily achieve with negative KDA if you just focus on farming (even during teamfights). If you are laning with a Kog'Maw and you allow him most of the CS and you dominate your lane with him on URF, going 12/0/10, you still only get A if you didn't farm.

I'm not saying that CS should be removed from the calculation completely But, based on all my games I played since the grades system exists, I feel like it's a bit too heavy in these gamemodes where you don't solo-lane. It's the most common reason why your grade is way too high or low based on your self-evaluated performance. Again, in Summoner's Rift, this is okay. Because having a low CS as ADC/Mid/Top means that it's a point of weakness that you have to focus on. However if you willingly give your CS to the lategame carry in your lane, and stomp lane with him simultaneously, I don't think they should rate it as a weakness.

Perhaps change the factor to "amount of minions wasted in lane" because it's way better for your team if you allow one player to focus on farming to not mess up too much farm (hence the support meta).

I know Riot is working on the Grades system and maybe they have already tackled this issue in an upcoming change, but I just wanted to throw it out here.