It seems to me that you are asking a pair of shoes in Poser to do something that shoes in real life don't do. Have you ever seen a woman bend her toes up in a pair of heels? The shoes don't bend with the foot, they raise up with the top of the foot, stretch out a bit. They don't bend like that.

If I had a nickle for ever time a woman told me to get lost, I could buy Manhattan.