What don't you like about Kirwyn's hair?

You probably just need to adjust the settings. You can make it straighter or curlier, longer or shorter, more responsive, etc.

You might also have to increase the density.  There was a change after Poser 7 (I think).  Hair and fur created before then looks sparse in later version of Poser. 

You can run the sim, then increase the density before you render (so it won't eat too many computer resources).