It sounds to me like you have way to much random "doctoring" going on, honestly. It is easy to have this happen with neuro symptoms. I am in Minnesota also, so I know how it can work here with our abundance of medical options, and how these Doctors can start bouncing off each other. The first thing is it sounds like you are having was too many EMG's and mini EMG's. I don't believe for a minute you have ALS. The symptoms don't add up and the EMG's all coming back normal pretty much ends that speculation, or should have a long time ago.
Sounds like you are hooked up with Mayo now. Okay. If however they give you another "wait and see" or fail to definitely rule out ALS, I suggest you get yourself hooked up with The University of Minnesota ALS Clinic. That is our clinic and I found them to be fast and efficient, which honestly is more than I can say for Mayo no matter how knowlegable they are. AS to your EMG question, it sounds like you should not have further testing at all let alone requesting specific parts. Again, if Mayo does not send you away ALS cleared for good, please go to the U of M. Meanwhile know that your odds of having ALS at that point with normal EMG's are just about zero.