I wouldn't worry about the lead. 2ppm is nothing. If it continues to come back on future UOA, then you might start to figure out where it's coming from. I'm guessing it won't come back, at least not consistently.
I'm looking at the oxidation the last two UOAs. Is it higher because of the fuel, or is Honda using more PAO in their most recent formulation? The additive package looks identical for all four UOAs, my guess is the extra fuel is breaking the oil down. I'd drop the oil change interval to 8000 km and see what it looks like. If it looks good for two consecutive oil change intervals, then maybe that is the sweet spot for this car.