I don't care about my KDR at all at this point. Will just use a token to reset my stats once/if they fix the game and I really do want to try and keep a high KDR. --- http://www.youtube.com/watch?v=oKHRKUzd6KI&feature=youtu.be
The reason you're probably doing worse, is since you're only being paired with people who have the DLC. Most of the time, the people who have the DLC are the more hardcore gamers and the better players.