Well, assuming you've been using the same product for the last two OCIs, we can rule out the whole "premium synthetics cleaning up what dinos left behind", can we not? How many Amsoil OCIs have been consequtive before these two? Are there others?
It's certainly not outside contamination (dirt, water, coolant, etc) causing the issue.
I think we're left with two possible causes:
1) the Amsoil may grossly affecting some of the wear metal readings, or
2) you've got an underlying mechanical issue trying to tell you something
The Pb and Tn and Al are low enough to not warrant concern after 14k miles. And the Fe is moderate. But the Cu is high, and getting higher.
The Cu could be a reactionary issue; many people contend that this type of reading is not "wear", but rather the removal of oxidation layers by the premium synthetics. Perhaps ... But the real problem I always point out with this debate is that when the Cu is so darn high from this purported "reaction", that it can totally mask real problems, or conversely put people into a panic that might not be legitimate. How can you know what it "noise" in a UOA and what is a true problem with numbers like that?
Essentially, you've got about 28k miles of high Cu readings in total, with two UOAs. If it were me, I'd ditch the Amsoil and try a few short OCIs with a quality dino product of your choice.
I am NOT blaming the Amsoil. The intent is to rule out the Amsoil as the contributing factor. The only way to know that for sure is to be able to repeat it's affect on the oil. Remove the Amsoil, run a couple of flush OCIs, then see where the Cu lands. Then, add Amsoil back. If the Amsoil is simply causing a reactionary oxidation removal issue, it will return. If the Amsoil is not the issue, the Cu will not drop with the dino fluids.
If the Cu drops with the dino fluids, then Amsoil is the culprit. That does not mean you cannot or should not use it; it's just a matter of being able to predict your elevated Cu.
If the Cu does not drop with the use of dino fluids, you've got mechanical issues.