Assuming your CH is high enough, then I’d try regular additions of Ahh-some using their maintenance dose procedure. Check the website or ask ahhsomeguy by PM for the secret recipe.
Bromine is fine. If that’s your sanitizer of choice, then you might want to see how much an ozonator for the tub would cost. Might be better than UV as the ozone will help to regenerate the spent bromide back into bromine.
Couldn’t find the maintenance dose procedure so I sent an email to the address on the website. Here’’s the answer...
I recommend that you get some Hot Tub Serum Total Maintenance. This is added weekly and works great. It is available at Amazon or at many hot tub dealers nationwide.