Somehow I lost the good alignment, where the lock can be frequently acquired and hence I didn't go further ahead.
I will try locking the DRMI during the weekend again. My goal is to take time series when the DRMI is being locked and sensing matrix.
Currently SRM is slightly misaligned such that the MICH optical gain at AS55Q doesn't increase so much with the presence of SRM.
With this condition I was able to acquire the lock more frequently than how it used to be on the Wednesday.
The next step is to gradually align SRM, to optimize the controls and to repeat this process several times until SRM is fully aligned.