Sailor Steve is correct to say that the unique 'Anti-Humming Bird' mod is present in NYGM.
However, your description suggests a possible further explanation: the 'Crash-Dive Blues', which has been well covered in previous posts (see the NYGM sticky).
Briefly, if you crash-dive, but change the crash-dive depth while you are still diving, the U-boat sinks in tail-down mode, which is hard to control, so you have to compensate by using higher, and noisier, speeds. This problem affects stock SH3, and all super-mods, but is more obvious with NYGM's anti-humming-bird mod.
There are two solutions:
1. If you crash-dive, don't change the diving depth until you reach the fixed crash-dive depth (normally 80 metres; 20 metres for Type II boats). If you make a mistake, and remember this golden rule too late, the only solution is to rise back above 80 metres, then to crash-dive a second time and allow the U-boat to level out before diving again.
2. The preferred method to fast-dive is to use the diving planes (press 'D') at flank speed (press '5'). This means you go down a little slower than with a crash-dive, but you do not have to worry about the diving depth. Just set the diving depth immediately to 160 metres (or whatever you prefer).
Crash-dive if an aircraft attacks, and allow the U-boat to reach 80 metres before you do anything else.
Fast-dive (option (2) ) when attacked by destroyers.
Stiebler.
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