I just got my favorite pair of CL's and I'm so disappointed, because they are so uncomfortable. They are the Black Decolletes and I got size 40.5, since the 40 was too snug when I tried them on at Neiman Marcus. When I wore them to work yesterday, my heel was slipping out of the back and the ball of my foot was killing me. I can't return them now that I have worn them outside. Can anyone recommend what I can put in the shoes to prevent the heel slippage and help the pain on the ball of my foot. TIA