It doesn't seem all too hard. Mine was at 37, and then it dipped back down when I played with some crappy friends. I was playing 45 - 50s and I was going shit like +10 to +15 K/D ratio in almost every game. I think what's stopping me is the lack of good teammates, but I'm not as serious with it as you are.

Oh ya and the other night you shoulda been like "Hey smith wanna play double team?" to get rid of SilverbackOne. I don't wanna be a dick to him, I used to play Rainbow Six all the time with him in Germany. That's all you gotta say, though, and we coulda hit up the double team and left him there. It was comical how he was calling commands in the game and we weren't even paying attention. He's much better at Rainbow Six, though. Anyways, I betcha we could get level 50 on double team if we tried(or barely tried).