Scent can't hurt; it may be an advantage: My .02. I'm always more confident when I know it's out there. Something which has worked well for me when throwing cranks is PowerBait paste. It's popular trout bait back in the Hills and I always bring back some or keep it stocked from on-line. When I'm getting a lot of follows or swipes; a good smear of the stuff has been powerful magic. When I know this is the ticket, I mold a small glob on the underside of the lip where it joins the body: It doesn't affect the action when you keep it small and ensure it's "aerodynamic".