Check out the fishing tips section on this board under old tips. It will show you how to rig a sandshrimp on a hook. http://www.piscatorialpursuits.com/tips/sandshrimp.htm

I don't plunk with pyramid weights so I can't help you here. I fish mainline to a 1/0 or 2/0 hook and baitloop with yarn and with tubing and lead wire about an arm's length above the hook. I've caught summer steelhead with this setup.