I have been meaning to share with you that over the summer I got to a bad state where even all of my previous controls and theories on IBS just could not get me back in control.
The only way I broke the cycle was by applying some basic principles of the Hay diet; and for me this was only carbohydrates and fats for breakfast, only proteins for lunch, only carbohydrates and fats for tea. Fruits only before a meal, not after.
Not mixing carbohydrates and proteins was the key. The reason for this is that the pancreas apparently releases enzymes sequentially depending on the food detected, and does not cope well with mixed foods. If you eat these food types separately, your pancreas can focus on the food type and digest it more effectively, so preventing partially undigested food arriving at your colon. The fats slow down the whole process even further and give the digestion more time, again promoting completeness. Just eating a single food for lunch (e.g. fish or meat) is quite refreshing, it feels lighter and more natural in some way.