If you have celiac disease, "mostly" gluten-free won't cut it. Every bit of gluten does damage. You also heal continuously on a gluten-free diet. What you need to do is keep the rate of healing running faster than the damage caused by accidental ingestion of gluten. Deliberate ingestion of gluten will set you back in the race. Any value you perceive from it is completely false.
I am a type 1 diabetic. My repeated hypoglycemic incidents led me to ask questions. Sometimes, after food, my blood sugar would rise, but sometimes it would continue dropping. What the **?
Some carbs are absorbed in the stomach. I was getting those ones (juices, fruits), but others do not get absorbed until they are in the intestines (complex carbs such as bread).
It took years, and a random discovery by my wife, to realize that: (1) there is a correlation between type 1 diabetes and celiac disease; and (2) all of my mystery symptoms could be caused by celiac disease.
My PCP told my that is was a rare childhood disease, but agreed to have me tested for it. I had a very strong positive on the biopsy. I knew then what was causing my sickness, and have never intentionally eaten gluten again.