Having two dogs tends to solve a lot of the problems of having one dog.
When we had a single dog, discipline with a rolled up sheet of newspaper seemed to be effective. It causes no harm, makes a lot of noise and gets the point across. Also a firm voice, rolling them on their back and grabbing a handfull of scruff, seems to communicate dominance in a way that is natural for the dog.
Once you get a couple of dogs properly socialized, they teach it to a new dog, the last two dogs we have had learned submission from the old dogs and never required intervention to keep them from being dominant in the house.
Diet? Is the dog getting a food very high in protein? Only working dogs need very high protein food.
Dogs are scavengers. They look for food hungry or not. Try feeding more or more often. Maybe the dog is just really hungry.
Pheromones. There is a product made with lactating female dog hormones. It calms dogs, making them feel soothed like a nursing puppy. Can be put on collar or plugged into wall
Flirt pole. You can wear a dog out fast with this exercise tool. It’s a prey chasing game. Instructions on the net for making these.
Ignore bad behaviour. Isolate immediately when dog acts up.
When dog acts up do not escalate by yelling. Become calmer
My pit did all the things yours did till he was about a year. Then he calmed down and is the very best dog we have ever had. Seems like your dog should have matured by now. Your dog has epilepsy. It’s not a normal, healthy dog.
Is it really imperative upon you to maintain an animal that is ill and may not ever be able to function normally in a family setting? Do you really want to put this dog up for rescue when the next family might abuse it in their anger and dissapointment? This is a dog, not a human. If you’ve done all you can, then maybe the adult thing is to have the dog put down humanely. That’s what we would have to do with our pit if he ever shows signs of human aggression. It would mean he has a breeding defect that, we did not cause but that we must address as responsible dog owners.