I haven't read what Cutler and Huggins have written, but I would be careful about attributing many of the detox symptoms to mercury. I did an experiment and asked a friend who did also have a few amalgams to remove them and start to detox with ALA. He never had a problem with his amalgams, and didn't get any side-effects from detoxing. His amalgams were also worn, but he had more of them than I, but I'm still struggling with detoxing soon 1 year after the removal.
I am sure ALA takes out some mercury from my friend too, but he simply does not get any detox effects. So, I would say the detox symtoms are mainly from die-offs of candida and other parasites. If you havent obtained them, despite having been exposed to mercury, then you don't appear to get any detox symptoms even if mercury comes out.