"I've made my own breastmorphs in Hexagon , because I also wasn't very pleased with the original V4-morphs, which I didn't found very natural. I also had to make a seperate morphs for the nipples, because they kept pointing upwards. It's a long time ago I did this, so I don't precise anymore how the whole proces of import/export was: I know I used a obj-file of the chest and you have to be sure that vertex-order isn't disturbed, otherwise you get exploding breasts. Nowadays I work with Zbrush and GoZ to make my morphs which is much easier."

I found Hexagon a real pain to work with, and it had very little documentation at the time. V4 breast morphs are ok for fantasy or the very young but as for adult women you are right, not very natural. I looked at zbrush, a lot of people talk about it, but at 800$ it's not going to happen right now. Kid in college and all that... Thank you for the suggestion. :--)