Your survey does not load for me, all I'm getting is a loading animation.
Lack of proper research is a huge problem in this domain. I tend to basically ignore any research in this field, because barely any survey is correctly constructed (if you haven't, please study social survey design; some time ago I took this course and it was decent) or research is done only on junior programmers (read: students), and nobody does proper experiments. I talked to a friend in a local agile consultancy agency and he told me that they wish they could open a proper lab for testing hypotheses in a scientific way, but it would take a lot of money with the current job market.