Don't underestimate the TII in GWX with 3km range and it not leaving a bubble trail you can get off a few shots at several ships from outside the convoy and they wont get alerted until the first one goes off, by then it will be too late for the other targets
by the time the TIII becomes available with 5km range its time to leave those TIs at home or maybe take only 1 or 2 for juicy targets at long range at night
concerning accuracy over range, yes the TI is better but when you have a good angle on the convoy, TIIs and TIIIs will do the trick as well, just be ready to fire a little earlier or to have your boat already turned a few degrees to get that zero gyro-angle necessary for good marksmanship.
as for your crash-diving when the first torpedoe hits, that's not something I'd recommend unless your still near your firing point or close to an escort, otherwise it might be smarter to just slowly go deeper say at 3 or 4 knts or even 2 for total silence as soon as your last fish has left the tubes, I find that being farther away from your firing point when the escort gets there and him having no idea where you went, even if you're only at 80 meters down is better than making a lot of noise while getting deeper because they will hear you going at flank speed and know your general heading from the firing point and thus be a lot closer to your sub when you do go silent.
I've noticed that keeping steely-calm and not making noise turns out to work better than following your instinct to get the hell out of dodge. But then not every situation is the same
btw in 39 and 40 (before radar) it pays to try a night-surface attack with decks awash even in GWX
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