Thank you all for your nice comments! Greatly appreciated!
@azn_132: You are correct. It's not a DD it's a light cruiser, Southampton class, if I recall correctly.
@Mush Martin: For the leapover with the steep climb angle I had to make some attempts. It's all about timing. I started at 200 meters and tried different speeds. After 20-30 tries I got it right. The under water roll was easy on the other hand. If the speed of the boat is high, the rudder pressure (hard port or starboard) makes the boat roll by oneself. But since the boat looses "height" fast I set the crush depth to 500 meters to be able to recover
form the roll.
Cheers!
Mr. Fleck