Casting instructors say the No. 1 casting flaw is overpowering. It's a natural impulse to push harder when you need the line to go farther, or when you're excited by the presence of feeding fish and rush to get a fly in front of them. But too much force will degrade your cast. Casting with a decidedly light touch can make an amazing difference.
As they say, let the rod and line do the work. Both are products of decades of fly-fishing experience, meticulously designed for top performance. Use a light touch so you can take advantage of that design expertise.”
Source: This and other ideas on how to groove your cast can be found in the most recent newsletter from Flyshack.com. To receive this newsletter, go to Fly Shack Newsletter