A1: when did you download the files? I just downloaded and the monitors are there.

However, if you are using an older version, the monitors are not supported. If this is the case, please upgrade the software.
A2: you are right. It seems it uses the radius from height+radius sweep. Please add this line before the interpolation:
radius=E.radius;
I tested and it works fine.
A3: yes, the new version can have field profile monitor that records E and H. Please try the newest version.