Elo Gains Should Be Reduced When You Play an Overpowered Champion

Obviously, there are some champions that are way too overpowered. I propose that for every 1% winrate above 50% that a champion has, all elo gains on that champion are reduced by 5%. For example, if you play a champion with a 55% winrate, your elo gain if you win would be reduced by 25%. Additionally, your elo loss would be increased by the same amount (25%).

As an added bonus, this could also be applied in the opposite way to underpowered champions. For every 1% winrate a champion is below 50%, your elo gains are increased by 5% and your elo losses are reduced by 5%.