I think that transcending the emotional roller coaster of winning or losing is an important step towards objectively evaluating game play.
Transcending the emotional roller coaster of in game chat is also a very important step in objective evaluation of game play.
Your negativity is an important opportunity for you to apply the same criticism to your wins that you do to your losses.
Moreover, I think that the attitude of playing 1v9 is absolutely what you need to do if it helps you make that leap.
"If you survive, an elevated existence awaits." - Excision & Downlink