The torpedo speed the TDC was useing was wrong. When you have mixed T1/T2 torpedoes loaded in the tubes the TDC never auto-sets the T2s to the correct speed when switching between them.
The work-around is when you go to the tube loaded with the T2 click on the torpedo's speed switch. That'll set the TDC to use the correct speed for the T2 torpedo.
Also, get in the habbit of useing all steam, or all electric, loadouts. Up until 1943 I like useing T2s in spring/summer and T1s in fall/winter. After 43 I stick with T1s and just do long range spreads into convoys with the low speed setting.
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