Ranked LP

So after attempting to climb ranked, I've observed what I consider flaws in the system that could be improved greatly. Firstly, I would propose that LP loss be based upon position and KDA per game. So if midlane is doing well but the other two lanes are making careless plays and the game becomes a 30 minute game with he mid lane having a 10/2/7 KDA and bot lane is 2/7/3 and 2/8/4 then the mid lane would lose less LP or if they do well enough not lose any LP at all whereas you lose more LP the more severe your KDA is. Secondly, the position would need to be considered to, such as type of champion and role, so if they are Janna support then their score would be weighted differently then Syndra mid. This is just a suggestion that I think could greatly improve the ranked system and make it more enjoyable and encourage better gameply. I can't count how many ranked games I've played where one player gives up and just starts making careless plays when they were doing well or another player make a poor champion choice for a particular position and results in a severe disadvantage for the rest of the team. It just feels like a real waste when you are trying your best to carry and make good plays and several team mates do so poorly that it makes it nearly impossible to win and you end up getting punished as badly as them. Any thoughts?