The DPI/OPI sliders work together to determine how aggressive CBs/WRs are. So for example say I have Offensive PI at 100 the WR's will play more passive because in the AI's mind there is more of a chance to get called for OPI, so lowering it will cause the WR to play more freely and true to their ratings without the fear of being called for a penalty.
So for my set I have OPI/DPI both set at 1, here is an example of a pass downfield:
http://s1019.photobucket.com/user/Ma...71841.mp4.html
Like I said the goal of my slider set was to make passing harder, I see some spectacular catches every now and then, but they are not overly common, I'd say I complete about 2 passes over 20 Yds a game (Not counting YAC).