I am glad if I can help someone in real life or cyberspace.

As to the SFEMG, I have written ad nauseum about this test and all its variations.

It does make life easier if it is diagnostic, but in some patients it just isn't.
no matter if they stand on their head, put on a fake nose or jump up and down (if they still can).

there are many possible reasons why it is normal in some patients with MG, but the reasons don't matter, what matters is the fact. some patients with clinically evident myasthenia (typical or less typical) will have a normal SFEMG. and its not because they (0r their neurologists) did not try hard enough to get a diagnostic test.

this is a fact of life that people have to accept, just like the fact that there is no real Santa-Claus (sorry if I ruined it for someone).