Ok I did some thinking for this recently because in bronze I encountered this while climbing
I would lose more lp as I ranked up and it would reset my level to bronze 5 so I went in and out of bronze 4 I think that a consistent amount of lp lost and gained meaning that the lp lost and gained would be the same. It would be better that way. Idk if this is something anybody else encounters but i'm just speaking my mind.