Working Kennels

[Gypsy Wolf]

Hi all,
Being new to the breed, I am very interested in what kennels are known for producing working vlcaks, particularly those who produce vlcaks for dog sports such as Schutzhund, Mondio Ring, etc.
I think, as a breed, certain dog sports are "natural" to the vlcak, such as tracking/trailing, hunting, agility, and because they are such an intelligent breed, I think arenas such as Rally or Obedience are also easy for a vlcak.
Dog sports that involve defense and fight drive do require certain character traits that are specific and not necessarily desirable in a dog for a pet home.
Hardness, sharpness, high drive, pack drive, prey/retrieve drive, intensity, focus, handler sensitivity, stability, courage and that thing called "heart."
With their heritage being made up of hard-core working German Shepherds, we should see vlcaks with such a temperament. Of course it isn't always easy to live with or control if you don't have the knowledge or outlet for their drive.
Would love to hear who has or produces vlcaks with such temperaments - who else works in such dog sports and what lines they prefer and what breedings they look for.
Thank you all in advance for your knowledge.