http://books.google.com/books?id=tA...MQ6AEwAQ#v=onepage&q=Guo Songyi grain&f=false
^That references Guo Songyi's numbers some. His numbers show that late Ming, to Qing was not once, or twice, but thrice subsistence level.
A shi of rice is a volume measurement which weights 175-195 pounds. Your article says that the best guess for the annual consumption was 3.6 market shi per person per year. Which comes to 630-702 pounds. From your quote above Perkins said that the Chinese ate 285Kg (627 lb) of grains per person per year, which is just under the low end of Guo Songyi's range. That doesn't sound like a huge difference to me.
I've already answered that. There's a reason why we don't have many works like this to compare it against: Most people see them as too broad to provide anything historically relevant. Maddison's work often isn't challenged on a grand, all encompassing level. It's challenged on the ground, in certain places and periods. This is where it often shows its weaknesses. I listed a great number of them, but your reply was that Maddison had responded to these criticisms already. A response is not a refutation. If Maddison had been able to fully refute these historical criticisms, then I highly doubt that so many authors and scholars would still see Maddison's work as flawed, that so many alternative numbers for specific times and places would exist, and that references to his work would still need to remind the reader that these numbers should be approached with caution. As I said before, perhaps you should provide proof that Maddison's work is so widely accepted and reliable that it should be taken at face value. So far you've given vague assurances but haven't provided much to show that Maddison developed an indisputable and universal method.
Any historical game needs a base set of numbers to base it from. If you think you can come up with something better than Maddison then feel free to put them forward (with the reasons behind them). But if you think Maddison has the best numbers in the world then feel free to provide no other alternative.