New system for losing LP

Alright, we have all been there, where your one of your laners was having a shit day so he/she troll and feeds and purposely throws a game in your ranked game. You and the rest of your team did well, but thanks to that one person hyper feeding you lose. When you lose you take around a 20 LP hit, but why? You did everything you could, got objectives, farmed affectively, and even after you laner feeding you had a positive KDA. So why is it that you are punished for the trolling of one person? Well I may have an idea to lessen the hit of LP loss after a loss that you did well in. My idea is that you start off with your full LP loss, but as the game goes on you can take points away from it. Such as for every tower you assist on taking down, that's a point or two off, and for other things like good KDA, good farming, neutral objectives taken, 60% kill participation, etc. So you can take off points from your loss with like a maximum of 10 or something. So that way instead of a full 20 LP loss, you can lessen it to 10. I think a system like this will let player solo queue more without fear of losing tons of LP from troll and will also encourage players to play as a team and not surrender immediately and try to take objectives to lessen LP loss and maybe even turn the game around. I understand that my numbers aren't exactly all that useful, but I think a system like this could be implemented and used to encourage more solo queue ranked and even just ranking in general. What do y'all think?