You should be able to reduce the Hair From Guides count and get the result your looking for. You might need to do the render count too. If you post a scene I will have a look.
The issue here is your guides are not grounded. Use the Ground Strands modifer and ground your guides to a mesh before applying Hair from Guides. Right now no "hair" is getting created because of this.
Have a look at this video for Guides from Spline workflow:
There are many hairs going through your scalp mesh. Your guides need to end at or close to the surface of the mesh for them to ground correctly. I would suggest using the mesh that you created these from in Zbrush maybe.
