[Evermont]

I don't know if this is right but...

I think of it like a car's air filter. If you drive on dusty roads a lot your filter gets dirtier faster. On less dusty roads the filter stays clean longer. So lower A1c's would result from the lower concentration of BG because there's less opportunity for bad stuff to stick to the cells. It's not just that you go low, it's the time you spend being low and the extent of it.

Just a guess.