This is very interesting. My interpretation of to these results is:

• The work on improving the EIB control has been effective. The scattered light glitches that its motion produces during bad weather is at frequencies below 20Hz, and maybe even 15Hz, which will be more difficult to improve on.
• The main source of scattered light glitches 30Hz-50Hz during bad weather comes from the west end building. The WE suspension local control signal Sa_WE_F0_X_500Hz, may mean the suspension is moving, or that the ground around the suspension is moving. A more detailed analysis of all the position sensors in the WE building is needed to determine what is the source of scattered light in the WE building, but it is unlikely to be the mirror itself.