One ping will alert them to your presence (maybe), but won't give away your position unless they are right on top, in which case you won't be on the surface anyway.
Diving more quickly can only be done by adding speed. The angle of attack is the only thing that adding bods to the forward compartment impacts and there is no way of increasing the flooding rates of the ballast tanks.
When I run at 2kt i set depth for 15m which equates to about 13m which is perfect for just jutting the scope out of the water. In heavier weather staying at PD without broaching is harder. It's meant to be because it was in RL.
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