There are so many variables at play in situations like this, it is hard to say what to do. When I bought a pair of ballet flats that almost all YLF'ers raved about, I could not wear them for the same reason. I put heel grips in the back but they did not help so I gave them away. I'd hate to see you waste your money. It might help to post pictures and maybe someone will have an idea.

I had the same problem with keds and most other ballet flats. Can you order just one (perhaps the most inexpensive) pair in a bigger size and test them out with heel inserts (without exposing the sticky adhesive)? If that works then you can order the rest in the same size.

I agree with San, it's a pain to lose your money. I got the same flats she mentioned and ended up giving them away to Angie!