I've done that float a few times, and have camped and fished along the Delaware as well, all be it not in quite some time. If you are going to be floating and casting with no stopping along the way at deeper pools, eddies, and other structure, a curly grub, swim jig or wacky plastic as you are already doing is probably the best you can do. You may luck on a good one, but most likely they will be dinks, the river is full of them. I would suggest dedicated fishing trips, if you are trying to fish it properly.