The champion mastery system in aram gives more importance on cs than it should

So yeah, in summonner's rift I can understand, but if someone wants a chest in aram, you need to take farm..... the last thing you should be aiming for in aram. Probably because you just copy-pasted the system from SR to Howling abyss (I don't really mind you doing that though, just posting as a fact) say for example if I go 18/4/16 and 51 farm with kog'maw I get A+, and in another game, a Taliyah that goes 15/15 but with 92 farm (in a shorter game) gets S- it feels pretty discouraging :/ If you have other priorities it's fine, just leaving this here.

Or maybe the problem lies with the system rewarding goldd earned, and since kills/assists don't give that much....