Willow leafs will work almost as good as darts. That 36# fish I caught in April had a 21" shad in it's belly. Something must have been chasing those shad to have them bust the surface like that. The shad aren't feeding this time of year. The reason why they hit is pure aggression towards the dart.
I caught hickory shad one night on a back beach. They were breaking out all over the place and I thought that they were schoolies, but they wouldn't take my swimmer. I tied a fly out in front of the swimmer I was using and the show was on! They'd take the fly and when they felt the hook would come 3-4 feet out of the air. Soft mouths - I had to loosen my drag to next to nothing or it would tear out.
I livelined one for a couple of hours with no success.