Andy are you running auto targeting? If so try this do not lock onto the target and the torpedo running depth will stay at what ever you set it at.
Just aim at the part of the ship you want to hit.
What I do is set up my torpedoes before I get to a combat zone. I set them to contact, fast and 15 feet. 15 feet will sink almost any merchant or large war ship. Most of the time I have time to reset them if needed but if I don't 15 feet is a good choice. You need to reset all this after you load a save.
As to you lag problem. 128 to 256 seems a little high when you're in a combat zone let alone a harbor, I seldom go over 32X maybe 64 in the right circumstances.
At that high TC any large convoy or even several airplanes will slow down everything but the strongest machines in a harbor.
Magic
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Reported lost 11 Feb. 1942
Signature by depthtok33l
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