I really like Steph's boobs. Much more so than Vicky's. I also really like the muscularity morphs on Steph that you mentioned. Those two reasons right there are enough for me to prefer Steph over Vicky. As to your problem, I haven't encountered it yet. Maybe I haven't cranked up the dial as much as you have or used the same combination of morphs, but the Stephs I've made have still had great-looking breasts even when they are cut and muscular, and I don't THINK I used any extra morphs, but I could be wrong on that one...