there area million variables on answers to the question I think ...or 2 …..casting and dragging a road runner works sometimes . casting and free falling a jig with no float and reeling works sometimes . casting and slowly dragging a float works sometimes . casting and not dragging the float works sometimes . casting and twitching the float and not dragging works sometimes . casting and dragging and twitching the float works sometimes .and yes casting and bumping the bottom works sometimes as well .
so in synopsis I would say try all the above and any variable you can think of . some of it depends on where and when and some of it is just a guess till you get bit .