It sounds like you may have a a slight case of steattorhea? Do these otter poops float as well?

Because if so, it might be some slight absorption issue. I seem to have one, my poops being very much like you describe. Both, at times.

But when I went on an exclusion diet and then added things back in I realised I apparently have a slight gluten sensitivity. Leaving out gluten and dairy completely made an insane change. Even when I would eat greasy chicken wings, I wouldn’t get dem greasy otter poops. Just like, more regular poops, despite what I ate.

I’m not saying you have the same thing, just saying I had that.

Related though, there is I believe like an over-the-counter supplement that’s enzymes which help with the absorption / break down of the food, because greasy stools can be a result of too little of some pancreatic enzymes or something.

Am not a trained medical professional, btw, so don’t take medical advice from me. But like, things to look up at least.