It doesn't look like there would be as good energy transfer between the boot and the binding since the boot is raised a little off the binding and sitting on the locking mechanism. Maybe if you could reduce the size of the locking mechanism, or find a way to recess it into the base plate? That way the boot has full contact with the footbed? Looks like you are working hard I hope you find some success!
These bindings are death traps. Do people even ride step in bindings? I hate to break it to you op but these are not kickass, they are pretty stupid and look poorly made. I want these to get made so I can steal a pair and then shit on it.