Hi Tar! Welcome to the forum. Interesting issues you have! I would recommend you contact Ed Erickson at Autumn Breeze Kennel-his information is on the gun-dog-trainers.com website, or you can go to
http://www.abkvc.com. He has been training many diverse breeds of hunting dogs for years, including Vizsla's and Weim's, and has had great success with NAVHDA trialed dogs too.
Hope this helps!