Since nominal IMC CMS IN1 gain was changed due to the work reported in original post, I changed IMC CMS IN2 gain and LSC-MCL servo.
I changed IMC CMS IN2 gain from 7dB to 2dB because IN1 gain was changed frm 23dB to 18dB.
For MCL, I reduced the gain by -1.8dB so that crossover frequency of MCL keeps 100Hz.
Figure 1 shows the crossover frequency measurement result after gain adjustment, which seems fine.