We also have a different House rule that has proven to be very interesting:
We use the Chinese Setup from 1942 but instead of Suiyuan having 2 Inf, we add an additional Inf in Yunnan (thous having 3 Inf 1 Fig)…
The Japanese player can still opt to got for it with 3 Inf 2 Fig, but it is an evenly and very costly battle.
Having more boots in China also makes the abundance of Japanese transports in 1941 less of a problem since the Japanese player has to send a bit more Infantry to China to counter them.
We found this setup to be way more interesting and also historically accurate because China was a pain in the ass for Japan and it shouldn’t be that easy for Japan to defeat them.