I played with 4 fletch when I was first getting started because I was afraid if I wasn't paying attention, I would accidentally shoot an arrow with the cock feather in. I do think they straightened my arrows out faster but now (20 years later) I realize my arrows weren't tuned very good or they wouldn't need to depend on the fletching to correct them. I didn't notice them dragging the arrow on close shots-20 yards or under but past 30 I noticed a good drop. You should probably stay inside 20 for a while anyway. Also. you can shoot feathers cock in and not hurt a thing because they lay down against the riser. A vane won't and will cause fish tailing.