Wow that diagram didn't turn out anything like I hoped.
Anyways ummmm that's great. The paper technique worked
Well the permanent solution would be the electrical tape method. Instead of having the paper jammed in your slot all the time, what you do is open up the cart and place a few pieces of electrical tape over one another where the contacts are. This thickens the PCB and has the same effect as the paper technique, and is a bit more of a permanent solution.
@dudeonline: The M3 Real has always had contact issues, it wasn't widespread, far from how many M3i Zeros are appearing, so you shouldn't really have to worry about it.