Change the LP loss and Gain system

I feel as Riot Games should rework the LP system to be where if you get under 10 deaths and over lets say 5 kills but are positive in KD ratio (not KDA ratio) you should not loose 20 LP you should gain little LP like 5-10 because it is not fare if you are doing good in lane phase then get thrown into a 13-1 Ekko or LeBlanc or any champion at that. The LP system now is not good because if you are having a great game but your team legitimately feeds all game and your score is lets say 15-3 and everyone else is around 2-10 why should you get punished. Yes this is a team game but YOUR RANK is your solo thing almost make it like the mastery system minus the whole you get 1000 points when you win and you go 3-11 but get 200 when you loose and go 20-3. Maybe implement the both so that if you get a mastery letter of B - B+ give 5 LP if the get A or higher they get 6-15 (when you loose) if you get C+ or lower then you loose LP but not ohhh i got S+ but lost 20 LP because all of my teammates went 2-14. So please riot I know you hate when people criticize the system but it really needs to be changed. Please. And for all of you supports your ratio would be assists to death ratio because we all no most supports wont get a lot of kills. ( those that say no most likely are the ones that go 1-10 and win cause they get carried)