I'm not sure a copper result of .07 is an issue. As I have posted before, I have never seen here on the forum or elsewhere the level at which iron and copper content become problematic but I don't think you're there.

As an aside, I seem to remember a post by Ben indicating that he didn't find copper to be naturally occurring......that it's almost always introduced to the pool thru additives from somewhere. I am certainly not contradicting you, Matt, but I bring it up to get myself corrected if I misread that post.