In my opinion adding weight to any wet fly or nymph hook does impair the action of the fly given to it by the river currents. When ever possible I will fish with unweighted flies unless the pool or run is so deep or swift that the only way to get close to the bottom is with a weighted fly. I don't fish the GP in great lake steelhead rivers but do large nymph imitations similar to the GP.
I think I have caught more fish with unweighted than weighted flies buts thats just a guess.
I personally dont care for weighted flies unless it is a streamer or a nymph. For everything else I try to fish them on some type of sinking tip configuration. The only streamers that I like weighted are clousers. The rest I fish on a sinking tip of some sort as well. My only exception to this would be tube flies made from aluminum or brass. Good Luck and Tight Lines!
I find the Black Practitioner fishes best on a floating line right in the surface film during low light conditions. In larger sizes it presents a good sillouette against low light. It's my fly of choice early morning and late evening on the Thompson.
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