Hello Graham, welcome back to our community!
Well, from what I can see from the image you posted, except for the strong motion around 11:10:00 (I assume those were steps or something similar), the new location of the Shake seems to offer very low noise at lower frequencies, and some generic noise bands around ~21 and ~37Hz.
It is difficult to pinpoint what is(are) the source(s) of that noise, however. You could try moving the Shake again and see if, in other locations, the noise is reduced/disappears.
Regarding your second query, if you meant the diagrams shown in this image, for example, you can create them via Python.
Sheeny has created an interesting and well-documented topic that covers what he has done, here: My current Python Report for code examples