Its simple. If you care that much about W/L then don't play alone. iI've come to notcie that if you play in a group of 3 or smaller that the game tend to send you into lobbies that have already started and are almost done. Group of 4-6 is your best option.
Either that or become so good in lone wolf playing that you can single handedly win the game for your team.
I have 2 accounts. My main GT which i always play with my crew which consist of 4 players at a W/L of 16.38 playing SnD and TDM. My second account is for when i want to lone wolf and just play by myself and my W/L for that playing solo is 3.96, and thats by using my L96 and 44. Magnum