J2simpso - thank you for all this research!
A couple quick caveats. Most of the links that you're posting here are for one week runs, and that's not a mileage run. Mileage runs are typically defined as straight out, straight back, reducing costs by not needing to get hotels, etc.
Secondly, if you ARE making a pure mileage run (or for that matter, ANY 'straight out and back' run to China, chances are good you're going to need a visa, and that adds several hundred dollars to the cost of the trip. That can be supplanted by making a connecting run to Hong Kong or other South Asian locale, but that also adds expense and time.
Good fares, and I hope I can use them later this spring.