Sorry about the delay. I was hoping my instructor/guide would respond. The answer to your situation (as best as I can give you) is line control. The fly needs to be moving fast enough that there is little slack in the line. When the fly flails around too much, there are more chances to snag down toward the bottom or lose feeling of a strike when on top.
I highly recommend playing around with different lengths of tungsten shooting heads. You need to figure out which length will give you the best combination of castability and line control.
Enjoy your surf fishing!
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Denny - Doin' it real since 1969. dennis@flyfishingspecialties.com
If a person is to be fixated on anything, fly fishing is the way to go. Unlimited room for growth, it soothes the soul and the destinations are limitless. The only sport I know of where we can have as much fun taking brookies from a piddley little creek or chasing steelhead in BC.
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