Don't worry about the number of vet changes, just find one you're comfortable with.
You might want to see if anyone near you is a reproduction specialist. These people tend to have their heads screwed on straight, know the "ethics" of breeding, understand about OFA'ing pet dogs (as opposed to breeding stock), are familiar with raw diets, alternative treatments, etc. I wouldn't trade the docs at the practice that we go to for anything in the world, they are worth their weight in platinum!!!