Have you had a Autonomic Function Test? I am scheduled for one, but I do not know if it will zero in on anything.

I wish I had further insight for you but it is interesting your A1Cs are very good but your fasting glucose has bounced around. Interestingly, my A1Cs are at 5.5, but I have never done a fasting. I have read they are more sensitive than a normal A1C. How many fasting tests did you do to get those results?