If you look at the Pacific Theater, the inflection point is later, really amping up in late 1943.

I'd imagine a one contributing factor is fixing the ridiculously buggy Mark 14 torpedo, which cleared up right about that time: https://en.wikipedia.org/wiki/Mark_14_torpedo

Here's a great video on it: https://youtu.be/eQ5Ru7Zu_1I?si=_1ujGsLQumraKz1Q