For larger busts, a wider band (longline style) distributes pressure across a larger surface area, reducing the "digging" sensation.
Ironically, a band that is can feel tighter than it actually is. When the band doesn't provide 80% of the support, the breasts pull the cups forward and down, tilting the band up your back and causing it to "saw" into your skin. Always ensure the band is level across your back for the most comfortable distribution of weight. tight bras busty
Take a deep breath. If you feel the band "locking" your ribs or preventing a full inhale, the size is wrong. For larger busts, a wider band (longline style)