As the Axis, you must utilize all of your resources simultaneously until you achieve a higher collective IPC count than the Allies. You can take out the Pearl Harbor fleet, as well as buy transports on J1 in order to support the Asian invasion. Taking out the Pearl Harbor fleet with every last one of your available ships will cripple the Us effort in the Pacific, giving Japan plenty of time to buy transports at will. I usually take both BB, a trans for cannon fodder, sub, AC, and the fighter from Japan. Then I use the fighter from Philip, and those 2 inf to support SE Asia, and Bomber from Japan can help out either cause.
If US tries to retalliate with its BB and trans, and planes, they will almost always lose leaving u with at least 1 BB or even both. Then u have at least 3 more turns to do what you wish in the pacific.