Try wearing a sports bra that actually hold them in place by encapsulating and compressing them separately.

As a ballet dancer being big busted (34FF) had been my “pain” for years, particularly when doing my 32 Sauté jumps in class. Regular sports bras worked well… for a short while until the material stretched over time and lost the support time and time again. Sports bras that are excellent for dancers are the Enell brand ones and there’s also Panache brand. Either one will prevent the bouncing around. I never go into dance class without my Enell! Amazon has them. For wider straps, go with Enell. If you’re looking for slightly thinner straps, probably Panache’s the better route.