See those are pretty much the opposite of what I experience, which means you probably just need to adjust your sliders. I have to limit my playcalling to avoid blowing out the cpu most game. While the run game may not get a consistent 2-5 yards I do get 100+ yards on 25 or less carries pretty much every game. I also have alot of trouble NOT stopping the cpu run game. Lastly I have always found the QBs to play like total idiots and far worse than their rating. I know the sliders don't do all that much in this game but mess with them anyway.
Btw I am using Adambroskis sliders from the Slider section with run blocking bumped up to 80 for me and the cpu.