My least favourite part of POB

On my 4th circumnavigation I set sail for Desolation Island and Jack's doomed mining venture looms it's ugly head.

I honestly feel O'Brian overwrote landlubber Jack's unremitting naivete. Whether it's reasonable to suppose that such a keen judge of men afloat should be such a hopeless waif ashore, I find it overcooked and grating.

I suppose I'll have to skim through those parts, but for me it really detracts from the writing, the character and the enjoyment of the novel.

Is it just me?

Added: Let me note that it's not the concept that I grow weary with, but the extent to which it's carried.