One variation on u-505 opening that i like to use. I dont think its been mentioned yet:
dd to take out the tran. Sub to take out jap sub in sz45. tran from australia to take New gunea. Tran from india to take Borneo. AC to block retake of borneo by placing in sz 49. Your are only 2 to 1 favorite to take borneo with 2 inf vs 1, but when u do, it sure slows japan down. And with this open, they have so many targets, there no way they can pearl.
What are you doing with the fighter? Leaving with CV?
Attack the sub and land on US CV
Help with one of the two land grabs, then land it on the CV
Help with Transport attack then land it in China or USSR.