I don't use CM's very much so I don't know. It is my defenders that get 90% of my YC's. Now my opponents CM's get a whole lot of them. I play a 4-2-3-1 or sometimes a 4-4-2 or 4-3-3 with no CM/CDM. I play LW/CAM/RW every game. I can afford to do this most games because I have a 2*+ advantage except against a couple league teams where I am forced to play defensive mids.

You would think that having no CM's against so many teams with 2-3 that there would be space for the opp to make plays from there but they end up with 4-6 ratings and a load of cards.