I tend to avoid type I when possible, even preferring type II with magnetic pistol.
Of course i get many bad torp, but as i systematically set 6M depth magnetic for all ships to avoid the fastidious clicking book identification ... working good so far, even better when type III becomes available.
Type I is too catastrophic on magnetic pistols…
Distance is not a problem either, I always try to infiltrate escorts, preferably from front, firing very close plenty times between convoy rows.
Until 1943… where comes the Fat torp and later the Lut ones, an other story…
__________________
|