I put my woolies on this way... (not original, I wish I could remember who wrote it and where....)
remove the string from the bow, fold string in half(knocking pt) and half again... This is the first set of woolies... once they are in, I fold into thirds and put in another set of woolies...
I shoot em in and let them untwist, then trim em down small...
I read somewhere about how the noise in strings is from vibration and harmonics... it seems that the majority of noise is from the string oscillating... Since the arrow is at the center the 1/4 points are the next logical location but then the thirds make sense too... by using small woolies at 1/4 and 1/3 location on the string... It supposedly helps by keeping the oscillation to a minimum....
since going to 3 under, I am really sold on this technique...