I had the CO2 guardians paused on the 20W setting for several locks tonight. During this time we had several lock losses and were back up again without any issues - DRMI was locking within 2 minutes. Given that it didn't seem to make a difference I have remove the 2W CO2 powers and now it's just set for 20W to make things simpler (CO2X=0.6W and CO2Y=0.3W).

We tried common ITM ring heater changes this evening, 0.25W on each segment. RF18 leveled off around 58, down from 61, so we stopped and dropped the RH levels back down.

Currently ITMY ring heater is set to 1.8W, turning it down did not help, eventually lost lock to a 0.45 Hz instability, DHARD, CHARD, DSOFT, PRC1 pitch were oscillating a lot. As soon as we start approaching RF18 ~ 50 again the ASC starts becoming more unstable. At this point PRCL gain had dropped to about 60% of its value on power up to 20W. Increasing CO2X also didn't help. This time the 3.5Hz oscillation in the SOFT loops. DRMI is now currently struggling to lock, some big bullseye modes can be seen. Hopefully the CO2 and RH changes will settle down soon for the day shift...