Tie LP gains/losses to champion mastery score
Winning wins LP. Losing loses LP. That should not change.
Winning with an S rank performance should winyou more LP than winning with a C rank performance.
Losing with a B rank should lose you less LP than losing with a D rank.
LP +/- logic currently (your MMR vs their MMR) does not make sense. You're supposed to play against people of the same MMR. There are now too many variables in the matchmaking system that get in the way of climbing. Premades now are just another factor added to the chaos.
If LP gains are tied to mastery score, a public indicator of ability and accomplishment within a single game, a player will be rewarded for consistency even when faced with other variables.
A few results:
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Feeders would lose more LP than non-feeding teammates.
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Carrying a game will net you more LP than barely scraping by.
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Being the best player on a losing team will save you LP.
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Being a feeder on a winning team will earn you less LP.
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BOOSTING WILL BE MORE DIFFICULT - A player getting boosted in a premade would have to play up to the standards of those boosting him, otherwise boost accounts will have to find a way to shave LP to let him keep up.
All of the results make sense. How would this not be a good thing.