I did some tests on the bsc chambers this morning 

• closed stage 1 and 2 Rz controls on ETMX ETMY ITMX ITMY with 750mHz blend filters ("T750mHz" in FM2) - first and second screenshots-

They have been left on during the day (from ~19:00 UTC) to eventually get some offline data. The oplev yaw see some minor improvement for ITMx and ETMx, but nothing for the other two chambers (first screenshot). The references are without the Rz loops running. The second screenshot is for the cps afficionados. 

• open st2 rz and reduced the stage 1 rz blend to 45mHz to observe the z->rz coupling -third screenshot-

the references are with st1 rz closed at 750mHz. When the blend is low -45mHz-, st2 gs13 signal is better between 0.2Hz and 5Hz but worse below 0.2Hz. The st1 cps see a large relative motion with the ground at low frequencies. 

I didn't have a chance to try the last configuration with the subtraction path engaged.

The dtt templates are under /ligo/svncommon/SeiSVN/seismic/BSC-ISI/H1/{chamber}/Data/Spectra/Isolated