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Good that you found the problem area. I would still recommend what I suggested before about low vis epoxy.
I am sure many places sell something similar to my recommendation.
I have no affiliation with the site or owner, just good experiences.

My 1964 16' has had a total delam problem. The fault is me and previous owner neglect, bad repairs ect.
I am going to try to post pics as it is pretty [not] epic in scope. Not transom related.