Last night I tried running the corner station BSC's in with some blends provided by RichM. The end stations stayed in the old configuration. Attached plots show the performance of ITMX vs ETMX. I compare RX/Y on ETMX and RY/X on ITMX. The results are mixed. Dashed lines are ITMX, solid lines are ETMX.

Something else to note, ITMX was not performing as well as the other chambers (something like an order of magnitude worse at a few hz, no different at low frequency though), the new blends now bring it's performance up to the other chambers. I've looked at the blends and all other controls components on this chamber, and haven't been able to find a reason for the difference. Suspicious. Last plot shows the difference, red and blue are the new blends, green and brown(?) are from the previous night with the "old" blends.