Well -- it could also be your diet -- like the oatmeal.... you could be eating things like that -- that are triggering attacks for you. I couldn't get stable at that low of a dose -- but we are all different. Just like the fibers all do different things for us. Some work for one better than another.
BTW -- oatmeal bothers me too. I don't actually get D attacks from it anymore --- just gas and bloating. It's funny how those things that are supposed to be good for us -- aren't.