well i use the patriots playbook, n some proclaim its tuff stopping the run with that playbook because it doesnt have 46 or 4-3, but ive found a very good run d for myself, i pick 3-4 stacked, shift my line left and my linebackers right, this is a great run d for me. also if they're never running to the inside, then shifting ur lbs to the outside along with the line left, works even better to stop the outside run on both sides...