Isn't the problem with straps that people use them as footstraps and not toestraps? When buying my first windsurfing kit I remember being instructed to install the straps in such a way as to not have room for more than my toes under them.
I have them very loose with the idea of hooking my foot under them. if I relax my foot it comes out very easily. I think this is the best way to use them. If you really snug your foot in there then you might be asking for trouble.
