The Poser Walk designer walks look goofy to me no matter how they are tweaked.

There are stationary animated walk poses available at Renderotica for V4, Aiko 3 and 4 and Terai Yuki 2 and they include poses with or without breast bounce. These are designed specificly for walking in place and to look more natural than the Poser walk designer can usually create.

These products offer a beefy readme for poser animation and full tech support from the maker of the pose.

Just search the store at Renderotica (or animotions) for "V4 Strut" or "A3 Strut" or TY2 Strut"

Dont let the "adult" nature of Renderotica scare you. There are some great products available there (as well as very helpful staff and artists).

just make sure you're 18 years of age or over =)