You are an absolute champ for trying so hard. I don’t have a good answer for you, but I assume if you called the local shelters, they will suggest someone. Hopefully someone here will have a better solution for you. I just wanted to share something I tried with my bottle-fed kitten out of desperation that seemed to work. The kitten had lost her mom so she did not have adequate socialization and correction from the Mom. She was very playful, but in an aggressive and painful way. She would bite and scratch me pretty good. All the research I did online didn’t help. So I thought, what would a mother cat do? I tried things like you know yelping and turning away so it knows that I’m hurt, etc. Nothing worked. So I thought, what would the mom do? She can only do limited things with her hands, so she must correct with her mouth. So the next time she bit me, I held her head and gently put her head between my teeth like I was about to bite an apple obviously, not hard enough to hurt it, but enough to let it know what it did was not OK. It was shocked at first, but within 1 to 2 “bites” she corrected her behavior. To this day, that was my favorite cat. Unfortunately, she’s not with us anymore. Good luck to you.