The problem with this thinking for this game is there is no Adaptive AI. So, if you are waiting for the CPU to adapt to what you're doing you'll be waiting forever while leading the nation is sacks and negative rushing yards by 1,000. There are many things you can do to make your playing experience more realistic and enjoyable. A lot of guys on this forum have been working hard to come up with ideas, sliders and roster edits to do just that. This game has flaws directly out of the box...flaws that the user can take advantage of.
BUT...
EA gave us full reigns in editing. So a couple of things off the top of my head:
1) Pursuit- The pursuit ratings for players out of the box is ridiculously high...especially for defensive lineman. You may wanna check that out.
2) AI blocking- They need YOUR help! Try raising their ACCELERATION rating and raising the PASS BLK/RUN BLK slider while toning your PASS DEFENSE and RUSH DEFENSE slider down.
3) Coaching Sliders- A couple of guys have come up with some excellent coaching sliders in the SLIDER section of this site. Check em out.
4) As hard as it may be for you...expand your horizons as a defensive coach lol! I mean since you're dominating running the 5-2...how good would you do running 3-3-5, 4-3, 3-4 or 4-2-5 ? Challenge yourself...do something different!
5) Do you switch men on defense so that you make all the plays yourself? If so, then try playing as 1 guy during the entire play and let you CPU teammates play their position.
In other words, use what's at your disposal to make the game more fun and challenging for you! Come on bro!