That's a tough one, I'm not sure if that has something to do with the cpu's gameplans. I notice in my games it's kind of random. Sometimes the cpu insists in just running the ball even if it's not working for them, other times they are passing the ball way more than running. For the most part most games I see the cpu trying to run the ball more than pass.
You may want to lower the cpu run game just a bit and if you feel it's also going to be too easy for you to run the ball, lower your run game a bit to. Previously, I had User Run block at 35 and cpu run block at 75, most people liked it there.