The "plays defensed" ranking probably gets better if you were throwing out Northwestern, Georgia Southern, and Oklahoma. Those of course were the games we lost that Chinander coached, and our defense was on the field a lot.
But you're right overall, and I've thought that the soft coverage "bend but don't break" style that Chinander was playing paired horribly with our bad offensive line. When your O-line is that bad, why not take some chances on defense? If you don't, you wind up in a vicious cycle, just like your stats indicate.