They are measuring the actual spin of the particle via a weak measurement (http://physicsworld.com/cws/article/news/46193) and EM wave simply would not give the results they produce.

The particle has to be there and as the work shows its in both slits at the same time (see the graphs) there is no denying what it is seeing.

That's why this is going to haunt lots of theories like yours above it's dead in the water.

This result is a profound as the original double slit experiment.

I can't explain it, I don't like it but I have to accept it.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.