G-Man
Given that the additive system is totally different, that is an amazing improvement in one oil change. You have to figure that some of those wear numbers are residual from the previous oil. If so, the next OCI should come in a tad lower.
At Terry's lab, with the repeatability I've seen, those are significant changes. You have to remember that at the lab Terry uses, Rotrode spectroscopy is used. That equipment is generally good to within 1-2ppm absolute. Since samples do not need to be diluted, there is no additional error introduced by sample preparation. I've consistently seen variation on multiple samples be within 1 ppm.
Your Pb and Cu changes are definitely outside of the error noise floor. To think differently would indicate a lack of understanding of the method and the lab itself. I would bet anyone here $100, or a nice Steak dinner with wine, which ever is more expensive, that your next UOA with the same oil will perform just as well.