I'll toss my two cents in there in the five minutes I have here. The frustrating thing about modeling Japanese ASW is that it was so blasted inconsistent. And then there seem to be two wars: the one according to the bean counters' research after the war ("Japanese ASW was normally mediocre at best and much of the time incompetent") and the experiences of the submariners themselves as expressed, for example at
http://www.ussubvetsofworldwarii.org/RememberIndex.html and in fact all over the ussubvetsofworldwarii.org site, as difficult to navigate as it is.
In there you'll see "cavalier" Dick O'Kane deciding he was the hunted rather than the hunter when he encountered radar equipped planes coordinating with radar equipped escorts. Getting to the convoy wasn't the issue. Getting the hell out of Dodge was, and accomplishing it was not a given.
You have to remember that the American sub war was top secret, and that throttled the voices of the men who actually participated and left us with the defective (in my view) voices of the historians, who never fired a torpedo, never nearly ran out of oxygen in a 30 hour depth charging, never lost a buddy in a sister submarine. But they know it all, just ask them!
Spend some time on the site. Listen to the voices of the ones who really knew and understood what they were up against. See if that doesn't change your opinion of Japanese ASW somewhat.
WARNING: the voice of the American hero is addictive and will consume many hours or days. What a shame that we're losing hundreds of them every day now. The day when their voice is entirely silent is not far off.
And my five minutes to post is gone. I'll rejoin later.