Thank you all for your advice.  I went out and bought the yoke pads recommended by Snow_Dog and Woods_Walker.  I was fortunate that here in St. Paul, MN there is a shop that repairs canoes and builds custom canoes and they sell the CVCA yoke pads for the same price as the manufacturer.  The people at the shop were very nice and they let me try the yoke pads on my canoe and test them before buying them.  The sling pads are a lot nicer than the U-shaped yoke pad I have been using.  The U-shape has a tendency to tip so that the canoe is always trying to slide backwards off your shoulders, and, the back part of the U rests on your neck (pain in the neck).

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