I’d stick with the Larry Harris scheme (factory in Sink for 5 doesn’t seem right), just add a total of 5 inf to what China already has. 1941 requires even more inf I think as China is much too weak.
If Japan can destroy China by Turn 3 something isn’t right IMHO. A pro Japan should capture China by Turn 4-5, India by 6-8, and start threatening Moscow around Turn 10. If Germany/Italy can still hold out for a few more turns at this point then the Axis probably deserves the win.