I have quite a bit of experience with Andy Cutler's protocol so I thought I would comment.
since you have not used dmsa yet I would start there. probably doing three months of dmsa would probably be a good idea. Remember, with DMSA you want to take it every four hours for at least three days and then break for at least one more day than you chelate. ALA crosses the blood brain barrier and DMSA does not. so the whole idea is you want to get your body burden down using DMSA before you start using ALA. Does that make sense?
This is probably the wrong part of this forum to discuss this, so i will stop here, but contact me if you want to write more about this.