I've read that many people have other food sensitivities in addition to starch which can cause inflammation. The most common ones are:

Gluten (wheat flour, white flour, breads, pastas, etc)
Corn
Soy
Dairy
Nightshades (tomatoes & peppers, eggplants & potatoes also fall under this umbrella but I'm assuming you had eliminated these with NSD)

I've heard that doing a reset where you combine AIP and NSD (extremely hard, I know) and then slowly add foods back in to see what your specific triggers are can be helpful.