Your best bet will be to try several different styles. I imagine what is happening is that as the breasts are being lifted, the dense breast tissue is being positioned in an awkwardly, perhaps pinching or leaning in on itself. Although in the chart I list a plunging bra is recommended for the teardrop shape, a balconette may be worth trying. Don't discount the idea of wearing an insert. That will add volume but without pinching. Although you said you're slim, teardrops are similar to bell-shaped although this is normally for larger ladies. A full-coverage bra may help you find comfort. With normally wider sides and straps you'll get more support.