The following settings seems to be working for now and I will commit it in the lscparams after a couple of IFO lock stretches.
New settings (ITMY05/06):- FM5 FM6 FM7 FM10 Gain +0.01 (new phase -90 degree), might increase the gain later on depending upon how slow the damping is.
Nominal settings (ITMY05/06): FM6 FM8 FM10 Gain +0.02 (phase -30deg)
Given below are settings I tried this morning and it did not work,
1. no phase, 0.01 gain - increase
2. -30 phase, -0.01 gain - increase
3. +30 phase, 0.01 gain - increase
4. -30 phase, 0.01 gain - IY05 decreasing (both filters) IY06 increasing (both filters)
5. -60 phase, 0.01 gain - IY05 decreasing (both filters) IY06 increasing (only in narrow filter)
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After talking to TJ, I have set the gain to zero on lscparams and saved it but not loaded it since we are OBSERVING. Will load it once there is a target or opportunity.
DARM spectra attached below shows that both the modes are slowly decreasing, next I will try and bump up the gain to 0.02.
ITMY 05/06 - FM5 FM6 FM7 FM10 Gain +0.02 has been saved in lscparams and violin mode Guardian has been loaded for the next lock.