I lowered the gain of the ASC HARD loops pretty significantly, and that has drastically improved our DARM sensitivity. 

It's starting to be hard to see where the coherence is coming from, but it looks like it's not really any of the ASC loops above 10 Hz.  (The coherences plots in the attachment were taken while A2L was running, so the 8 lines around 20Hz are ignore-able.) 

I ran A2L again, and there weren't any big changes, or improvements to the sensitivity. 

I turned off the MICH and SRCL feedforward for a while, so that I could see about re-tuning the FF filters.  I did SRCL injections starting at 09:00 UTC, MICH injections starting at 9:14 UTC, and PRCL injections starting at 9:23 UTC. 

Attached is a screenshot of my current HARD loop settings.  I have put them into guardian in the new LOWNOISE_ASC state that happens just before we switch to the lownoise ETMY ESD, but have not run the new code for this state yet.  Be mindful of this when going to lownoise tomorrow.

Other than PI damping work ongoing, the IFO is undisturbed, starting at 9:40 UTC.

Oh, and I know that we decided to run ER9 without OMC DCPD whitening in case the PIs got too big, but since they're okay right now, I have the whitening on so we can see the pretty new shot noise level that we have.