While there are many that claim their dog or the parents have SchH 1, 2 or 3 title and have the paperwork to prove it.. The dog proves otherwise. I have personally seen documented SchH 3 dogs that do not know what a dumbbell is (SAD, AND A VERY REAL PROBLEM). Likewise KKL1 and or VA rated dogs that would raise an eyebrow of even the inexperienced GSD owner.
The proof is in the pudding these days. You MUST meet the dogs and see them work for yourself to be certain those titles are valid. It is sad that these things happen, these things were once just isolated incidences, and sadly it is more common for some breeders to have dogs with paper titles these days.
Where are you buying your breeding stock? From brokers?
I know several breeders (some right here on this forum) who breed, raise, train, and title their own dogs. No sleight of hand there, you can go to the trials and see them for yourself. These are dogs bred, born, raised, trained and titled by the same person who knows their bloodlines inside and out. These are the people you should be working with!
Anyone doing the important work of breeding and training service dogs must realize the importance of first-hand experience with the breeding stock, as you say. Rather than keeping your breeding program secret, perhaps you should open up and share with other experienced breeder/trainers your findings, what was successful and what was not, and why... these breeders who breed, raise, train and title their own stock will probably be able to help you tremendously with your program, even shave years off your ultimate goal.