Iron seems pretty high, even considering that this is only the second UOA. Copper and tin seem a bit high, maybe from bronze turbo bearings, which would also produce iron from shaft wear. This might all be normal break-in wear. I'd try to find some other low mileage UOAs from this engine to compare it to.
The oil could have gone longer, but I'd stick to 6k miles for now, then do another UOA.