I always leave my jap fleet off the Philippines. You can hit so many places. there is an already built naval and air base ready for you. it makes it harder for ANZAC to support UK on the mainland. plus if you build a second fleet in japan, this will split the americans attention, because then they will have to defend Hawaii, and attack you. also when i take dei i also take western Australia, anzac never have land troops there, plus it will cause them to spend more on land units instead of navy or air.