To add, read alot of those articles, the deep running was fixed around the end of 1942 for Mark 14, early 1942 for the Mark 10.
Impact at 90 degree hits fixed around June 1943 for the fast moving Mark 14 (Mark 10 never suffered from thsi due to its slower speed).
They completely got rid of magnetic influence detenation (equator the Earth's field is too weak caused alot of premature explosions on the way to hit ship, or dud while passing under ship failing to go off).
Quote:
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The magnetic influence exploder was unquestionably responsible for sinking some, perhaps even a large fraction, of the 1.4 million gross registry tons of Japanese merchant ships sunk by submarines between December 1941 and August 1943. Reports from submarine commanding officers of apparent magnetic influence exploder failure, mainly duds and prematures, finally led to CinCPac ordering the disabling of the magnetic influence feature on 24 June 1943. ComSubSoWesPac reluctantly followed suit in December 194313. CinCPac's order was issued eighteen months after Jacobs, on Sargo's first war patrol, ordered the deactivation of the magnetic influence portion of the Mk.6 exploders in his torpedoes and incidentally got into considerable difficulty for doing so. Magnetic influence exploders were not used by US Navy submarines through the balance of WW II.
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