Champion Masteries helping ranked?
Pretty much, It could be like an S or A rank (+ neutral and -) could reduce LP loss on losses. And a D rank on wins could reduce LP gain on wins. You have a new system in place. Why not use it for something other than decoration. If you got an S rank in a loss then I don't think you deserve to lose a full 15-25 LP. This wouldn't affect placements or anything. Just a little help for players who generally play well. You still lose LP for losses and win LP for wins.