From: Hoorn (NED).
Getting anywhere in the Pacific with Japan indeed means a good understanding of invasions.
Personally, I almost never invade from a section below 3 and this means positioning your invaders and AMPHs well ahead.
During your surprise impulse, your invasions are much stronger because of the -1 Combat Factor the surprised Notionals get. This means you can invade almost everywhere without a problem, even with just 1 division because the notionals will have 0 Combar Factors.
After that, getting opposing Notionals -or whatever defenders- Out Of Supply (chasing off all their allied convoys and TRS), really ups your strength. In case some real forces opposing, you may need to also Disorganize them and first invade nearby hexes, then march towards them. Needless to say (I hope): always bring enough battleships + cruisers to at least double your invading/assaulting factors with shore bombardment.
Batavia is indeed your highest priority. When you control it, you will conquer the NEI and all its oil automatically. No need to invade the oil individually, unless you think taking Batavia will take a few turns instead of a few impulses, or some forces other than the NEI 's occupy those oil hexes. Or, if you need the oil this turn (I believe the conquest phase is after oil usage/saving).
After that, or at the same time if you have enough AMPH/TRS and landing forces, other high priorities are Singapore, Rabaul, Manila... And so on.
You are forgetting the partisan issue here. If there are partisans in NEI, they are usually placed on the oil fields. The Japanese better move those partisans out of the oil fields after they have DoW'ed the CW and occupy that hex with a division, if only because of the fact that the partisan will change sides during the conquest phase and than the controller will move them back on top of your precious oil field again...
< Message edited by Centuur -- 6/28/2018 12:24:31 PM >