I've spent hours and hours trying to improve the appearance of my characters' (rather large) breasts, including fussing endlessly with MTs and magnets to get the topslope reasonably smooth and the shape right. The biggest challenge has always been getting the cleavage right without breaking the mesh. I think I've finally had some success with V2 (see attached pic of a character I made a few months ago... my more recent characters are actually better). My latest characters are finally close to being acceptable, including shape and dynamics when the breasts bounce and jiggle.
V3 is completely hopeless IMO. Bizarre discontinuities at breast-collar interface, difficult-to-modify default shape, etc etc. My inability to solve V3's other flaws when she bends at the knee, elbow, and thigh convinced me to abandon her. TG