I think that the problem occurs to most of us as we try to reach out beyond intermediate distance -- we try to go from 40 - 60 feet to 60 -80 feet.
I think you must learn to double haul if you are concerned with line control as you go for distance. The double haul is not hard to learn (for most; it was for me); timing and smooth acceleration are everything.
Don't put too much line into your backcast. Learn to shoot line. If you are using a weight forward taper, just a little more than the heavy part of the line (forward taper) is needed to cast 80 feet or more, given a properly balanced outfit.
When we are first learning to cast farther, we tend to put more umph into the cast and we do it too soon. From my experience, trying to correct the most godawful macrame you can imagine, I learned to avoid tailing loops by letting the line straighten out behind me on the backcast and then pulling the line forward with my wrist stiff and forearm vertical, gradually accelerating the pull until my hand was extended the length of my forearm. Then THE STOP. (this unloads the rod). The line should come from behind your shoulder in a tight, smoothly unrolling loop.
The business of keeping a stiff wrist and a vertical forearm helped me to put a bend in the lower third of the rod. Putting flex, down low right through the corks, is what generates the energy and leverage for that long cast. For me, the wrist alone was not sufficient to bring out the power in the lower third of the rod.
Work on a gradual acceleration. Don't shock the system by putting too much power into the start of the forward cast. Too much power at the start of the forward cast will result in a tailing loop nearly every time.
Get Mel Krieger's book on flycasting, or rent a good instruction video and try to analyze, to the very best of your ability, what the good casters are doing when they go for distance. I had to learn this stuff a paragraph at a time. People who are natural athletes pick it up right away. Most anglers are between me and an athelete.
What I've described worked for me in correcting a very discouraging casting fault. Others, more knowledgeable and skilled than me, may have other suggestions.
For me, the concept of pulling the line with gradual acceleration from behind was the tip that started me on the road to recovery.
Always use a practice fly, as noted above.
Good luck and Cheers,
Last edited by Eric; 01-20-2009 at 12:39 AM.