Struggling in the Storm!!

[Bum]

Need some advice here. I'm using 100% manual TDC, I've got a convoy ahead of me in a major storm. Rain, waves, visibility is about 400m. Here's the problem: I get a sound check, I hear the bearing diverging around me port and starboard--I know the convoy is meeting me. I surface, with the TDC preset for a full bow salvo with 12degrees spread (makes no sense to try shooting 1 or two torps in these condition, not in full realistic mode). I have the ship ID book pulled up ready to select the target, get a lock, range, and AOB (speed set at 6 knots). As soon as a tanker or cargo ship appears ahead, I enter the data and fire the salvo. I've replayed the scenario 4 times--I get 2~3 hits, but almost every time the torps BONG off the side of the ship Am I too close?? And if so, how the H*LL do I hit a target I cannot see until it gets too close?

Teddy Bear, Observer, Kpt Lehmann, Sailor Steve--someone please advise