@MichaelHollywood
When I got my new 2023 Bullfrog hot tub delivered 2/2/24, I set it up as a Bromine tub. I did all the right things and was very particular about keeping the bromine levels in range. But my wife had a strong skin sensitivity issue to the bromine. After an hour or so, she started getting red ski, by bedtime she had a rash and bumps on her torso. Th eitching kept her awake all night. It took a few days to go away. I did another AHH!Some purge, drained and refilled the tub, and set it up as a chlorine tub. Now my wife has ZERO skin sensitivity in our chlorine tub, even if the FC is a ppm or two above the recommended range.
So bottom line, I'd say that Bromine would cause more, not less skin irritation issues. I'd say you may have some bad stuff hiding in your plumbing as CanadianSpaTech suggests (he knows his stuff!).