If you are doing a lot of casting with a drop shot rig you might want to put a small swivel about 12 to 18 inches above your hook. If you experience a lot of line twisting in the first hour or two, that is a real good indication that you are fishing it too fast. You should spend more time "shaking" this rig with your rod tip than retrieving it. Keep in mind that the intent of this technique was a light-line, controlled depth and finesse presentation by keeping the bait in the same place for an extended period of time.
As far as what baits work the best, that is like a lot of other fishing techniques. Whatever you have the most confidence in is going to work the best for you. Just remember to keep it small so that a light shaking action or current will keep it moving.
