Solo and Duo Q in ranked

I will put this out there now, that what I'm suggesting is somewhat difficult to implement (I don't even have a definitive answer for it). but now to the real thing.

What I see as the main problem for Solo and Duo queue in ranked is that no matter how good of a player you are that you cannot solely carry (duo carry) 3-4 other players when many problems may occur such as players : afking for multiple minutes / multiple times (especially if something crucial happens during such time) , straight out leaving , Feeding (intentional or just having a bad game / unskilled and not in correct MMR bracket because of some odd reason) , or everybody's favorite Trolls who have it just out to ruin the game for everyone to bring joy to their miserable little lives.

Leaving you at the point where you lose LP (and mmr) because you really could not do anything to turn around the game. I know there are others out there with same though so lets pool ideas community and figure something out to toss to riot for suggestion or to be heard and get them thinking about it to!

I know this will be brought up "why not go play ranked 5's, because not every one is capable of having 5 friends or reliable players (or players they want to play with) organized and on a good schedule to setup.

Edited(added) : possible solution, if the Game KDA deficit is greater than 20 put a LP reduction in place and a penalty for any player whom did not contribute to the team, at the same time put in coding to count tower assists, dragon/baron assists , how many wards some one bought and placed and other objective counters as well instead of just KDA and Tower kills since i know sometimes when i support ill die early and fight and lose out on sum assists because of time. And have it add all Objective / team contribution and do some way of adding/dividing it to give either Bonus LP on win or Less on win ,less LP loss, or more LP loss based off of it all.

TLDR: solo/duo q LP/MMR gain/loss is unreliable because of incapability of winning a TEAM 5v5 game because of trolls/feeders/afkers/leavers. either way SOMETHING needs to be done for solo/duo q