I'd say you will have to go with several hair parts. A good trick is to make the "edges" of each part a higher density than the inner part. That way the thinner parts will be obscured.

Also, as Fugazi said, try changing the hair thickness. But making the hair in several parts will give you the best result. It will also be a lot easier to style.

FREEBIES! | My Gallery | My Store | My FB | Tumblr |
You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.