Your truck is done "breaking in"; that happened a long time ago. OCIs will flush out residual from machining and break-in; usually 3-4 OCIs is enough to accomplish this, if the OCI duration is 3-5k miles each. With the mileage on this truck, you're way past that. If you tow a low, that can drive up the Fe a bit as well.
The Cu and Pb are not alarming, but cautionary. Never look at one UOA and think you have an entire scope of the issue, unless it's something like intrusion from coolant. Particle streaks are not uncommon, and this might just be such. If the Cu and Pb drop at the next OCI, then I'd not worry. If they escalate, you have an issue afoot. The Fe and Al fine. The Si is commendably low, indicating your air filtration is working (leave it alone).
Stick with the T6 for now; hold your inputs as consistent as possible.
You could get a Fumoto valve and "live sample" at 7k miles, and not have to dump oil.
Interestingly, bypass filtration may likely affect the results here, indicating that the PPM counts are very narrow in range. Spectral analysis will see particles up to about 5um"ish". Most bypass systems (you don't mention which you have) are very effective at 3um on up. So that filter is probably removing at least some of the wear particle evidence. I.E. - you may have a bit more wear than is showing up. However, bypass filtration only "samples" approximately 10% of the total flow, so it's anyone guess as to how much of the "evidence" is being removed. This topic has been debated to the end of time; no one really has a solid understanding and it's all hypothetical. Don't sweat it; I only bring it up as a matter of being acknowleged, not a point of contention.
Stick to your current M.O. for now; don't rock the boat by changing inputs. But once you get a handle on it, for goodness sake extend your OCIs or ditch the expensive products.