CuteLion: Great post. My experience has been so similar to yours, including DMPS being the most effective (albeit no injections for me).
It's now been 1.5 years since getting my fillings out and starting chelation, and although I thought I was finished I still have a ways to go. Just when you think you're finally mercury free, your body dumps some more out from somewhere where it was deeply hidden and you're back to square one again.
I especially noticed this when I started supplementing vitamin D, which increases glutathione levels in the brain, thus causing the brain to detox itself.