I think the Cutler plan sounds very reasonable in taking low doses of DMSA or ALA. As long as your body can excrete the heavy metals that the DMSA is pushing out of your cells then you should be fine. I'm a firm believer in people using a protocol that they believe in and that the feel makes sense to them.
All the people I talked to had been to clinics that gave them very large doses of DMPS or DMSA and their problems arose when their bodies just couldn't detox that much heavy metal at one time. So low doses sounds like a good plan.