The reason we have oat bran, buckwheat, millet, etc on the diet is because these are all prebiotic foods which feed the probiotics in your gut. What you need to get better is prebiotics, probiotics, and foods with FOS in them.
Sounds like you really went off the bandwagon there eh?
I wouldn’t worry about whether or not you have an “attack” after eating foods, I would worry more about the health of your gut and how good you feel in general. If you think you can go back to eating all of those poor quality foods regularly without any drawbacks, you have the wrong idea. It sounds like what you are doing is to see how “bad” you feel after eating these foods, and instead, you should be focusing on how “good” you feel after eating certain foods.
We don’t recommend eating beef on the diet because it can take days to digest it while chicken, turkey, and seafood takes hours to digest. I personally have found that I can digest all meats rather well except for beef and pork; buffalo is a great substitute for beef and you can digest it rather easily.
The coconut milk should be OK, but I personally don’t feel very good after eating it and it makes me have bad stools. I think its slightly bad personally but good for weight gain only.