Regarding what Bonehead said about the importance of the stop, particularly for a tight loop............very true.
Here's an interesting trick I saw once. When you are practicing casting, get about 40-50 feet of line out then trap it with the index finger of your casting hand. This frees your other hand for the trick: as bring your casting hand forward, towards the end of the casting stroke, give the rod a mild karate chop with your free hand just above the rod handle. (This "chop" is in the opposite direction that the rod is traveling; it serves as an extreme "sudden stop") I think you will be surprised at what it does.