When carrying a one piece paddle I would recommend laying the paddle on the crossbars just under the J rack before strapping down the kayak then secure it to the crossbars.
Wrong, Wrong, Wrong. The strap should come over the Kayak from the "J" Bar and then both the cam buckle and belt should come down and connect (around) the crossbar. This way the cam buckle is pulling at the bottom of the kayak as close to the kayak as possible. If you run the strap down and out to the rails of the crossbar your losing tension on the available circumference of the kayak.
