Have you tried an e-collar? Just curious.
Again, if you had an outdoors job 8 - 10 hours a day and your dog was with you the whole time, I think you'd have a different dog. I DO think they are much different from 50 - 75 years ago, yes. But they were designed to be at your side 24/7, going with you and doing stuff with you all day. They did breed them down into much easier dogs for average owners, but evidently they still yearn for that busy lifestyle. I had no idea I created the perfect lifestyle for my last Doberman back in the '90's. I was training horses, and as a puppy she went to the barn with me every day, stayed tied in the barn when I was on a horse & loose the rest of the time. I took her to weekly obedience classes from 6 to 9 months, by the time she was 6 months old I also let her go with me on trail rides. By the time she was 9 - 10 months old she was probably going 5 miles a day. I know, against all the rules now! Then at 11 months old she traveled with me to train horses in California for 6 weeks, then back home, then to AZ for 8 weeks, living in different places, meeting different people, always with horses coming & going, traveling across country in a truck pulling a 4 horse trailer, staying at motels, on & on. There was never a more perfect dog. Never had a "fear" period, never had "doberteens", never whined, never people or dog aggressive, just a perfect dog. She did have a good line of working dogs on her sires side, her dam was pretty generic pet dog. She lived to be 11 and never took a lame step or had a sick day in her life. Died in her sleep (so yes, sudden death/heart related, probably). She hooked me on the breed forever, and I just wonder how much the upbringing our Dobermans get changes how they act.