Try raising the offsides slider. Josh pointed out in his sliders set penalties DO affect gameplay. I haven't tested this enough myself, but after a few games I did get more sacks when I raised this penalty slider.
Still entirely inconclusive so don't hold me to it.
You can also practice generating pass rush yourself by usering the D line. Go to practice mode and work on your timing. You will get better at getting by the O linemen. I usually play MLB or S throughout the game, but if I'm not getting a pass rush, I come down into the box and try to make something happen.
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