blitz and and play with a DT.. You have to move around and cause the center and gaurd make a decision on how they are going to pick you up (swim move, power move straight, etc). Then quickly switch to the closest player to the ball carrier. Your LB's should fill. Can't do it every time as you have to go into a man cover 2 or a zone sometimes so you don't get burnt deep. I assume you have been using linebacker??? You have to be an DT and control the line of scrimage try to take up lineman and cause pressure the best you can. Good luck!