Stopping the run

I cannot seem to stop the run for anything. I was using mutliple d, but switched to Tennessee because of the 4-4. I play alot against this guy who uses the niners and gore breaks of chunks at a time. I can never stop him for less than 3 yards. 4-3, 3-4, 4-6, Man, zone, blitz packages, line shifts, crashing. Nothing seems to work. My guys get shucked like corn leaving at least 2 guys everytime to pick up my Lb's. Anything?

Hit square on ps3 select man coverage with a db select a flat coverage or blitz and loop the line defensive line shift too the end with the widest olm and pinch should get penatration and a stop behind the line of scrimage. Key is man coverage and wide blitz or good line coverage.