The U-boat certainly should not sink at 1-2 knots with NYGM.
Perhaps the U-boat is damaged?
However, it is very likely that this is another example of the famous 'Crash-dive blues' (How can one say that in German?)
If you change the diving depth after starting a crash-dive, for example to 150 metres, *before* the U-boat has levelled out at its crash-dive depth, then you will find it difficult to control the depth at 1-2 knots. This is a bug in the stock game, but it is worse with NYGM because of the diving model.
The solution is to rise slowly to a depth above the crash-dive depth, and then crash-dive again, allowing the U-boat to settle at its crash-dive depth before trying to go deeper. The crash-dive depth for most (but not all) of the U-boats in NYGM is 80 metres.
Stiebler.
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