could be a number of things.
1 magnetic pistol were unreliable early in the war, if you have dud torps as possibility in your realism settings it may be that.
2 you could be setting them to run too deep, again early war according the radio messages, the torps had a fault making them run deeper than set, add that to your deliberate clearance of the keel and you may be too deep to trigger.
3 the swell of the sea in high winds could be affecting the depth of your torps causing either them to run too deep (as above) or too shallow and strike the curved bottom of the ship.
for the reasons above I tend to avoid using magnetic pistols unless the ship I'm aiming at is too far off the 90 degree angle on bow to make a impact detonate. hope this helps or at least give you possibilites as to what is causing your problems
cheers,
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