Hmm, i don't know if it counts but i tried the single mission battle for the Philipines again today for the 123454th time without ever sinking her..with TMO 2.5
5 torpedoes later and she went down the deep

together with what looked like a nuclear explosion i guess the damage graphics decided to have a field day i was nearly blinded

, only difference this time was that i attacked somewhat late and she was passing along before i was able to fire 6 shots so all torpedoes hit her at an angle far from ideal, maybe that's the ticket i don't know i was never able to sink her before..even with 10 hits she would just sail along without me being able to overtake her
But that's just single mission play i don't know if that makes any difference, but it's alot of fun to be able to shoot at such a target while being bombed by 3-5 destroyers.
Sinking the Yamato is a great reward for a good job, so good for you