We are still losing lock more than 50% of the time once we start to increase the power into the interferometer. I slowed down the rotation stage to 10% of its normal speed. In this way I was able to make it to 10 W once. On the second try, the interferometer lost lock right after a gain step in the summing node board. The behavior of the CARM error signal does not seem any different from past successful power increases, so it is not clear to me what could be wrong with the summing node board.

In order to make it easier to engage the soft loops, I made the 20 dB boosts come on only when the soft loop error signals are less than 0.01 ct.

I also turned down all the hard loop gains by 6 dB and re-engaged the bounce mode notches in the suspension PUM drives, because the bounce modes were becoming unmanageable.