I can't answer all of these - but a few of em (the easier ones) I can.
displacement_surfaced - how much your sub "weighs" on the surface - this is with air in the MBT's - Not sure what the game uses it for - unless its incorporated in the DM
draught_surface - How deep is the lowest art of your sub - would be a keel if a sub had one. Note this setting is in METERS!
drag_surface - The Drag co-efficient used to affect acceleration, deceleration and top speed. Seems to have only a very minor effect - and apparently only in conjuction with sea state.
displacement_submerged - same as surfaced but now the MBT's are full of water.
draught_submerged - from "Full Submergence"
drag_submerged - seems mostly unused - see above
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