I hear a lot of "I got 15/5 and my team still loses". This is what separates people who actually know how to climb ELO. Its not about winning your lane, its about helping everyone win their lane. I win 80% of my games with Twisted Fate simply by side ganking every time I see a chance. At higher ELO's less deaths seem to happen in the laning phase until a side gank or jungler gank. The point is don't be so self centered and be pro team.