I don't see on this thread how much salt you're using. Just know that for salt to help bromine to the kidneys, you need enough water. So, maybe instead of the usual 1/4 tsp per liter, use 1/2 tsp per liter.
If you've oil-pulled, see if that helps draw out more bromine for you. It didn't help me, but it was a huge help for my husband. His bromine was largely in his lungs, though, and that might be the connection.
Sweating might help, as bromine easily exits that way -- parallel to its effect on skin.