I reduced the gain of the OMC length locking loop by a factor of 3, the UGF has gone from 10 Hz to 3 Hz, and added a 30 Hz low pass.  The new open loop is attached, as well as a spectrum of the drive signal before and after this change.  There are low passes in the PZT driver that mean this is not as dramatic a change in the OMC length RMS as it seems.  

Noise projections coming soon.