Are you thinking of the Mk.23? Which is basically a Mk.14 that has only the fastest speed setting and 4,500 yd range?
I disagree that the mk.10 is bad early war it is the most reliable torpedo you can use.
The S-boats are not terrible you just have to learn how to use them to good effect like any weapon.
You can get a Balao class sub in 1943 and in some mods you can get a Tench class sub as well but not until some time in 1944.
I'd agree that mods make the thermal layers more effective but they also make DDs and other enemy ASW vessels far more dangerous and difficult.A surface battle against a DD in TMO is pretty much suicide which it should be.Hell even a submerged battle against subs is nerve racking in TMO at times. Mods are a huge step they do make the game much better but they are also a huge jump in over all difficultly and anyone considering them should take this into account.You should fell fairly comfortable with the stock game before hand.
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