Magnetic shots at 90 degrees are still effective, generally the best angle is 45 degrees or less depending on the boat. A large boat like a tanker/warship or very large passenger ship (like the Queen Mary) the key is surface area that the torpedo can cover. In a 90 degree shot if you're depth is too low good chance it'll keep going, on a 45 degree it goes across more of the keel and has a longer period to make contact and detonate as the ship goes up and down from the water conditions. Impact setting may be more reliable (depending on the year) though magnetic hits can take down almost anything with a single eel. Biggest ship so far to go down from 1 magnetic hit was the Nelson (35,000 tons) with a shot directly under the middle turret. Once the fuses get fixed they give you the biggest bang for your buck.
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