from what I see in the vid...
2 things--
upper control arm bushing on passenger side seams way loose side to side movement..
Track bar mount hole looks to be elongated - that bolt is moving side to side opposite to itself when moving. (yes I know you loosened it) No matter how tight you get the TB bolt, if the holes are elongated it will still move under load.
----Alot of people to help with that will weld a washer to the front side if the appropriate size. The better option if you can is to drill out the hole in the TB itself and the hole in the TB mount to 1 size bigger if you can so everything in tight again. Of course you will need a new bolt of the correct size as well.