I checked the OMC ASC stability but its stability seems to change in each lock.
Figure 1 shows the time-series data when lock duration was long.
Figure 2 and 3 show the time-series data when lock duration was short.
In the case of fig2 and fig3, OMMT2 and OSTM pitch started to drift soon after OMC ASC was engaged.
So, OMC ASC doesn't seem to stable enough to use it during OBSERVATION at this moment.