Lynne, have you seen results w/Cathe in your butt so far? If so, then maybe you'd do well to stick w/her workouts.
I personally have seen some serious lower body results with P90X and I've not even been able to devote the time to an official rotation. I hope to by the end of the summer. I try to follow a semblence of rotation sequence as described by P90X but can't always do so, yet my butt is already smaller, tighter and my legs, especially inner thighs, are more defined. I can only imagine what will happen when I can get into a serious rotation!
Like Janice, I lift heavy, always have w/P90X.