When I came in this morning, DRMI was still locked and I had the place to myself, so I decided to try turning on the BSC RZ loops with a high blend. I was using SRCL, PRCL and MICH as witnesses. I was mostly able to turn the loops on without losing lock if I turned the loops on slowly, but the BS broke DRMI and Ed has been having a hard time getting DRMI back. I tried ITMX first, then added ITMY, then tried the BS. Attached plots show the cavity spectra for the baseline (in red), ITMX  RZ on(blue) and both ITM's RZ on in green. Not much change at low frequency, although SRCL and PRCL both improve some. But between 1 and 4 hz the RZ loops make things worse. I've returned the BSCs to their standard configuration.