Less than 3k miles on the oil, in an engine that is broken in...I'd say those aren't good numbers at all, especially the copper. I know GM's throw a lot, but it should be lower. I also know you stated that the UA for iron is 19, but its probably for a lot more than 3k miles, so its still high.
You'd get better results on dino oil at 3k miles intervals, and not waste as much money.