Sounds like the saddle got soaked through and then stretched by 220lb! I know of a lady cyclist who made a B17 into a perfect saddle by leaving it in a sink of water overnight with a brick on top. The wet leather stretched into a shape that was kind to her ... undercarriage.

I've had a couple of B17s and a B67 and have never had anything except comfortable miles...after the first 100 or so. Proofide three or four times a year.