I finally got up the courage to attack a convoy supported by 2 DDs. Use the Peroxide drive to excape from the DDs as they attack. This is when it should be used during attack. I was able to get away and setup on two merchants and continue to get away. This works fine and I can return to port with plenty of Peroxide left. Takes some training to find out how to use the Walther.....
Oh, another funny thing with the Walther Torpedos. Have you noticed yet that they fishtail like they are seaking the target ? What's with that ?
Working out ok now....
Regards
Jib01