You might want to consider friction. The friction of the wedge against the chip breaker is greater than between the chip breaker and the blade.

You may need to make 'fingers' at the sides of the wedge to reduce friction against the chip breaker.

Is the chip breaker held tight against the blade? From the screw to the front edge of where the breaker meets the blade it can be mostly open. From the screw away from the blade it should be without gap.

jtk