I never understood how you use them. Meaning not only you TIP but all who run the toe clips with regular shoes. These clips are intended to keep the strap up, so you can slip your shoe in. The contact between pedal and the shoe should be by the strap, and the small block attached to the shoe sole which engages the edge of the pedal cage (some late models use additional bracket).

I am using Simano 105 clips and straps on my beater, however the clips are plastic there and being more compliant they are not subject to much stress.