Hi, I've seen several ladies have purchased the Frye Veronica Shorties from NAS. If you have them, how do they fit you?

I tried these on in the store, but didn't walk around. I just had time to really try them on today and there is a huge amount of heel slip. (I'm sorry if this is a repeat question--I searched the archives before I posted). Is there something wonky with this years model? The website product reviews are mixed on the fit. I'm so sad! I want these boots to work!