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It might help to know the boat (well a bit) like is all that effort worth it. The bulkheads I would not expect to be soft ie rot unless water was getting at them. From where I would ask.
I would think that the books you cite would be a big help but I was under the impression that a hull hard spot led to flexing and strain adjacent to it, but a vertical crack suggests it is not that but perhaps working of the hull around bulkheads that were not adequately tabbed or were rotten.
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