Yeah, same here. It seems some of the values are right, if you use a position where the main girl grabs the partner girl's boobs she'll reach for where the partner's boobs *should* be, but they're displaying at the same size as the main girl.
(To test it I gave Robyn max-size boobs as the main girl, Layla min-size boobs as the partner, put them in Ride 'Em Cowgirl - Saddle Up and had Robyn put her hands on Layla's boobs, both girls had enormous breasts but Robyn was putting her hands inside Layla's as if they were supposed to be tiny. Then swapped the girls roles and both girls had tiny boobs, but Layla was stroking the air as if Robyn still had huge boobs.)