Heel grips that won't wrinkle up?

[WildThong]

I've one foot bigger than the other but find that these stick on heel grips start to wrinkle or curl up a bit from the edge as the glue loosens after a few wears. Any recommendations? Has anyone tried these shoe sizer inserts?

I've always found the Barrats ones good. They are kind of suede-y and are the only ones I've found that don't wrinkle.