How is the US holding Hawaii with just 50% of its resources if Japan just churns out navy continuously over its first few turns?
This one is EASY.
You don’t beat the Japanese navy for Hawaii, by building ship for ship. You beat it by building man for man, plane for plane.
J1 is almost never an attack, and they haven’t seen what you’re up to as the U.S. J1 isn’t likely to see EVERY Japanese unit on the board move for Hawaii… So.
If you want to hold hawaii, and you expect an attack, use your starting transport to bring over 1 inf 1 aa gun. Fly ALL your fighter craft onto the island (5 or 6?) Tacs, bombers too. Move your navy out of the way (WUS) and build into it, possibly another transport, or a fighter, or whatever. Chances are he wasn’t prepared to invade it on J2. Now that it’s defended, so he no attacks J2, and waits for J3. So you reinforce it again.
Then you end up at war. Japan is pulled into China, pulled into India, Pulled into Australia. Pulled against Hawaii. For sake of argument lets say they are making 50 - 60 IPC’s a turn.
The allies make U.S. 42, Anzac 10-15 China 10-15 India 10-15. During the opening attack rounds that is, and this is all dependant on the japanese strategy. The point is that 60 Japanese IPC’s vs 70 ish allied IPC’s means you’ve got a straight up fight. The more you force the Japanese to FOUCS on ONE target, the less targets they are out there taking. The more out of position they come.
Hawaii is the WORST place for the japanese to focus there efforts on early. You are basically throwing your fleet right at the U.S. income without hitting the tertiary targets and enemies of the empire. The sooner the U.S. has the Japanese fighting them on there front door, the better for the allies.