Japan is difficult to take with one monolithic territory to defend. Hokkaido in the north helps but is an ahistorical site for an invasion; industrialized Kyushu in the south was the historical choice, so representing it on the map should be fun. Furthermore, ANZAC + lots of new UK IPCs in the Pacific (and even a few new US IPCs) means that Japan may need a boost. I think Japan is plenty strong, so I’ll include both options.
Kyushu (2) split off from Japan (reduced to 6):
9529c955-df60-4fc1-a62b-1d3eb598e386-Kyushu.png
Kyushu (2) by itself (leaving Japan proper at 8 IPCs):
c3df59cc-00a1-4e4c-8ddb-2a13c7427159-Kyushu_only.png