I puchased a beautiful pair of open toed black satin d'orsay heels. They are an 8.5 (the size I always wear in this brand), but they slip off my heel making it impossible to walk in without looking like I have a limp or something. What should I do?? I hate the idea of putting those inserts in because they are so unattractive and you would see it when I take them off, but is there anything else that can be done? I'm nervous to exchange them for an 8 because I'm worried they will be too small. Does anyone else have this problem?