Single hook patterns give that good wounded baitfish look when jigged and many anglers prefer running singles as less tuning is required after a strike vs tandems. 

 We are showing some of these patterns in an underwater video in a water current so you can get a feel for what the fish see as a streamer moves thropugh the water

     These underwater videos do give an excellent example of how feathers move in water, which is why featherwing streamers are most effective in form and function. Notice how the feathers separate giving the imitation of a smelt tail.

     The less focused view the fish gets either due to stained water or indirect light actually makes the flash feather and body appear as one and as the flash moves it imitates the scale flash that a smelt creates.

     These single hook streamers are tunable, actually built on vinyl shrink tubing on the hook that you can rotate slightly. If the streamer is not running upright, maybe leaning a little hold the hook and twist at the head until you get the right look.

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Good luck and good fishing!