Or you could download the NYGM Tonnage Mod which not only gives you a new fatigue model that was completely revamped from the original system, changes the damage model for enemy shipping so that they flood and (sometimes) slowly sink instead of unrealistically blowing sky high with one torpedo, and (to me) most importantly get rid of renown.
In the NYGM Tonnage Mod, Medals and everything are based off of tonnage which is historically correct, and any upgrades you go for cost you time in drydock, not renown. You want a super boat all tricked out? Fine, but you'll spend 4 months in port.
It really does sound like the mod that best addresses most of your questions.
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