I'm the original poster.
First, let me clarify that 6300 miles is the correct amount for this UOA, and 10,000 was correct for the previous run. I'm not sure at the moment where the odometer readings went off track.
Second, I should have said, the previous run was Valvoline Synpower 5W-30 as well. I did not switch oils.
Usage was a 50/50 split city/highway.
A 27 for copper, to me, seems poor.
I've owned other GM pushrod V6's, a Ford DOHC V6, a Nissan 2.4, and copper readings were always in the single digits. Different oils. GC and MaxLife dino and M1.
So I'm guessing Synpower 5W-30 isn't the greatest of choices for this engine.
I switched to Quaker State dino 5W-30 for the current run, I will go about 6000 miles and probably run another UOA to compare the oils.