I also like calf tail even for small streamers. (they are not kip tails anymore.)
For use in longer sections I have found a little trick if you are confronted with too much curving in the fibers. After you clip a section free pinch it between your thumb and index finger and just roll it as you may have seen pictures of guys rolling cigarettes. When you do this the curved fibers will roll individually and sort of average out bending against each other making a neater bundle.