ok i held that up on accel time for 4 minutes or so.
then had to test something

crash dive ! i was under in a moment.
now you have got me into a new tactic hehe.
as for crew on deck not being as restrictive its possible they mean the fact that they pretty much hit the deck the second the tower starts breaking the water. (all crew guns and tower)
sorry about the pics, its the best i can do with my pc.