Honestly, I think you need a little variety in your diet. I think you should include small doses of IF at all meals, accompanied by SF. Just eating the same thing, daily, can put you in a "rut." Your body will protest/rebel--it's just nature! You're doing great, but with IBS, time and sensitivity is required. I think, also, that you could benefit from hypno. You do not sound like you are enjoying what you are eating. You sound (and I'm using my intuition here, so tell me if I'm way off base), as though you are tense when you are eating. This kind of psychic energy while eating is very detrimental for IBS. It is insulting to the gut. Breathe deeply, surround yourself with loving energy. Eat in a relaxed frame of mind.
Seriously, I do not think you are safely incorporating IF into you diet and I see you going in circles obsessing. I have IBS-D and I incorporate more IF in my diet. I think, you might do better trying to incorporate IF from a diversity of fruits/veggies versus grains. Maybe you're eating too many oat-based products? I find IF from fruits/veggies easier to tolerate, personally.
I'm sorry--I hear your frustration and I see how earnest you are for positive/desirable results--effective IBS-C management.