I just picked up and started reading this AAR. Very interesting stuff. Your South China gambit seems to have slowed Mr. Kane down, and since he relies on moving quickly rather than destroying allied assets, he has been placed behind schedule (which is probably causing him to make some mistakes such as sailing a division on cargo ships into 5 CVs, 3 BBs, and escorts).
A question? With your newly captured 50K supply from Toyohara, how much of that could you transport into China by submarine? Is Pakhoi still available as a port or would you have to go up the rivers and run mines and air attacks? Even 250 a day would make a big difference.
Keep in mind that his wildly revved-up PDU:On airforce will be coming into play soon, and the skies will be filled with Tojos, not the wily, but undergunned Oscars. Your fighter losses and bomber losses will skyrocket. If you are serious about staying in the Kuriles, I would get some AA guns up there, so they can do a lot of the damage in the middle and late months of 42. Forcing him to buy out the 54th probably used a lot of the political points he was saving to convert every squadron to Tojos. See if you can't make him buy out another division? The homeland is looking pretty sparse without the 54th. The next one will have to come from Korea.