Spiral is WAY to slow for me, I dont know about 5" sheilds but I just made my first 6 fletch the other day, using 4" sheilds, and it was too fast. I had a thread about my first 8 fletching arrow, still have been too snowed in to test the darn thing. And it is driving me crazy. But hopefully tommorrow if I finish my tanning my deer hide in time I will test it out! I know that I shot 5.5 high backs and they were only 3 and it slowed my arrow down almost as much as a flu flu. I want to find a arrow that is slow like a flu flu without the big feathers, cause when they are in my quiver they make noise when I shoot!