Torpedoes falling :s

[Krauter]

So, running through the western approaches campaign.

I'm hunting convoys south of Iceland and I run into a very nice target. Couple of troop transports, 2 freighters and a large Tanker. Sneak in, loose 1 torpedo at two troop transports (1 each) and two to the large tanker.

Not taking into account that the closest transport was closer then the other two targets, the fish hit and the convoy scatters. Even so, the tanker takes on amidship and one under the rudder. Two ships sunk.

Now my front tube is reloaded by the time the escorts are on me so I decide to loose that through the convoy (it's a FaT) I launch and looking on the TAI the torpedo isnt moving.. Launch tube 2 and go to external and I see the torpedo running, but struggling to keep depth with a high bow attitude.. WTF?? What is happening :s Did i put in too much fuel ?

Anyone had this problem at all?