Another look at the sensors after moving units around on Tuesday.  See attached for spectra from a quiet time around 3am local.   Robert sees things looking pretty good except for the drop in coherence on the Z dof between the ITMY and the HAM5 units.  This may be the 30 meters between those instruments but we don't see the coherence drop on the other DOFs.

I've recentered the Masses again on the ITMY unit to see if that helps.  The other differences seen mostly on the STS2 at the ETMX position are reasonable given the distances  to the other sensors.