The BS SIDE damping gain seemed too low. The gain had been 5 while the rest of the suspensions had gains of 90-500.
I increased the gain and set it to be 80.
I did the "Q of 5" test by kicking the BS SIDE motion to find the right gain value.
However there was a big cross coupling, which was most likely a coupling from the SIDE actuator to the POS motion.
Due to the cross coupling, the Q of 5 test didn't really show a nice ring down time series. I just put a gain of 80 to let the Q value sort of 5.
I think we should diagonalize the out matrices for all the suspensions at some point.