> Quote - Did you remove the corresponding channels in the thigh actors, as well, or only the ones in hip?

Only the ones in hip2, and only the smooth channels that relate to the thighs, not the one that relates to the hip.

Quote - Also, I can't help but wonder whether Antonia is in some way special (as in broken) or if this kind of thing happens with all figures.

I did a quick test with Posette, thighs bent -90, hip yScaled 150. There is no apparent asymmetry in Posette in this regard. The only difference between the Antonia rig and the Posette rig that stands out to my eye is the order of the channels. All the smoothScale channels are adjacent in Posette's hip.