I got cranky with changes made to this map which weakened Japan in its naval domination of the Pacific. What I think was the real problem was the weakness of China rather than the strength of Japan. The Burma Road can be attacked from Hopei and Tsinghai but neither of these territories can attack it in BM or G40 and all of the territories which could attack the Burma Rd in G40+BM can attack it in PtV.
FWIW.