I'm wondering if lead is now being excreted more heavily since there is less mercury to block excretion of other metals? I have heard that mercury can cause multiple metal toxicity due to the fact it can cause the body to hold onto them.

Just a thought. Unless there is some ongoing unknown exposure to lead.

I'd imagine though that the levels would fluctuate. Depending on how much is being excreted at the time. But hopefully, over time, you would see a reduction with lead as you have with mercury. The higher levels again may simply show it's coming out of you at a greater rate.