So, you guys are not going to get any results from changing displacement. Everything you need to change to tweak the maneuvering characteristics is the movement part of the ship data:
Quote:
SurfaceSpeed=16
SubmergedSpeed=0
AccelerationRate=0.08
DecelerationRate=0.08
RudderTurnRate=0.5
TurnRate=2
PivotPointTurning=0.256
DiveRate=0
SurfaceRate=0
BallastRate=0
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The movement system is based on translations, not actual boyancy physics. In fact, the boyancy physics do not kick in until ships/subs are damaged and start flooding.
The default settings for the subs were made to feel very responsive on purpose. Nobody likes sluggish, ketchup-bottle controls, realistic or not.