On Wednesday night, because we couldn't get much past DRMI due to wind, I tried changing the St1 blend on the BS ISI to match the "windy" blend used on the ITMs. This is a change that the commissioning crew and I have agreed should happen for a while, but we didn't want to disturb the IFO during data taking. Previously the BS was running the 45mhz blends in X&Y, while the ITM's were running the 90mhz blends in the beam direction. Looking at CPS spectra, this meant that the BS was moving a lot more at low frequency than the ITM's (see first attached spectra, BS is red and blue, ITM beam directions are in purple and black). Now that I've switched the BS, it is moving the same as the ITMs. Sheila suggested I look at the ASC signals during the subsequent lock (I left the blends because it was still "windy") to see if this affected the angular control of the IFO. I think at low frequency this made an improvement in MICH (second and third plots, which are ASC yaw and pitch for MICH, green is before, brown after on both). I checked the ground at both times to make sure the input motion was the same and there are differences, but not huge (last plot, green and brown are before, red and blue are after, solid is Y, dashed is X). I don't show Z but it was even more similar.