The Tench class did not have a stronger hull than the Balao class the main difference was that it had a better designed interior layout which made a it more efficient and allowed them to carry a few more torpedoes.
In TMO you do get the SV radar and the ST periscope radar with a Tench and it can go deeper than the Balao so with TMO there is some difference even though there was not a change between the two in reality hull strength wise.
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