A few thoughts:
ozone is a strong oxidizer and, even in a chlorine spa, creates localized oxidation of contaminants that chlorine misses. but I rather agree with RD -- ozone eats chlorine so its kind of a catch-22. I turned my ozone generator off when I'm using chlorine. ozone with bromine is quite another matter 🙂
Cassie -- yes, even though I am a fan of Serum I would start simple in your case. first, purge multiple times until the recommended ahh-some dose produces no new material and your filters are in their normal positions (what I call the cleanest spa known to man). then balance pH (dont' target TA), treat for metals only if that is a problem, turn the SWG off and use straight dichlor at 3ppm.