Well, I use MD 3.1 datafile, and I love the results I get with them. I blow people out, the CPU blows me out, there's close games, comebacks, rallies, it's great. Every game is different. It works for me. I tinkered them to try and have realistic K rates, and I do pretty well with those settings. The best way to get Ks is to get 2 quick strikes, and then stuff high in the zone (especially curveballs) and they always chase that for a strikeout.