Stick to the diet. The fact that you have gone from diarrhea to semi solid or pencil thin stools means you are improving. I am finding out that it takes a long time (months) for an inflamed colon to heal. Even if you have SIBO, the diet is very similar. Talk to your nutritionist about eliminating complex carbs and rice and potatoes from your diet for a while. Rice was actually giving me diarrhea. I am following the Specific Carbohydrate Diet and went from diarrhea to the type of stool you are describing. To me that has been a huge improvement. But I cannot eat a lot of food I easily ate three months ago.