continuous wave had a table that was closer to your reading, that was hull with console and listed dry weight at ~750 for the 16'-7" long hull.
Well that's a relief.
I ran a drill bit in the transom in a few places. Darkest was at the drain tubes, they were awful when I pulled em out. About 1/4" from outboard side the tubes, mainly the lower one.. was falling apart. Rest of the tube looked like old brass. Inboard side wasn't damp. Out was.
Stopped getting darker wood about 2 inches left and right.. but it goes down almost to the bottom. Dark wood wasn't soaked but damp. Still had wood texture it if any of that makes sense.
Which is where I had a decent chunk of gel coming up, about 5 inches in diameter.. Center roughly lines up with drain tube.
I'm thinking bc the original gel was good, the top coat (different color) was coming off bc previous owner did a bad rush job. Put it on thin, and a long time ago. When I ground back the top coat of gel (previous owner applied), widened the wound to get to where the peel or layer of gel wasn't separated from the chat, the coat under was solid. Not separated from the glass.
Other than that, no bubbling, no swelling, no other signs I've read about to indicate transom should be replaced. Bearing in mind I haven't been doing this for years.
Hope all that makes sense. Partly feel I'm babbling.