Definitely sounds like you might need to talk to your vet and get a trainer/behavioralist involved!
Any success stories or price wise how much these things cost? I feel like 1000 is efficient but over that is pretty crazy
Following because I have a very similar situation
You definitely need to try a behavioral course and speak to a vet about this, my dog was like this and we had to put her down bc she randomly attacked my brother while we was all watching a movie and led him to have to go to the hospital and he had to get stitches all over his face and now has a fear of dogs
Could you take them to a behavioral course? Some of them do boarding for the dogs to teach them how to handle new situations for some time.