A so-called jump roll will help you cast farther. The cast, in my mind, is basically a touch-and-go spey cast, a cast used by Scandinavian-style spey casters. Also, it's important that you begin your forward cast before slack weakens the d-loop. Some good casters feel that the way to keep slack out of their d-loop is to start the forward cast just before the fly stops moving towards you. Finally, to maintain line tension on the fly rod, I hold the line against the handle with my finger. Then, when I abruptly stop the rod on my forward cast, I let the line go. A downward haul will also maintain line tension.

Randy