Leave about a 3" gap between the swivel and the lead. This prevents the swivel from getting hung. Also, try doubling up on the lead line. The trick here is to spin both lines between both thumbs and forefingers and spiral them together like a polypro rope. Then carefully crimp on the first lead piece without losing the spiralled part between the swivel eye and the lead. Do this part at home. Play add-on on the river.