We had two ~12 hour locks Friday and Saturday night and ~3 hour lock today. A new PI rang up in both about 6 hours into lock; 15606 Hz on ITMX, now MODE3. I've added damping settings to medm, StripTool, and SUS_PI guardian. Currently It's set to be damped using the PLL; we'll have to wait for another long lock to see the success. 

Modes 17 & 25 (ETMX 15541.5 Hz & ETMY 15542 Hz) continue to be tricky. Friday night they were both under passive BP (after having PLL jumping problems previously). They rang up about two orders of magnitude before slowly damping (first trend). Saturday night Mode 17 was put under PLL control and there's no large ringup (only a slight upward trend over the 12 hours). Tonight, still in this configuration, I saw the same sudden ring up after about 3 hours. Switching away from PLL to BP only rang up more quickly. Again, with Mode 17 in PLL and Mode 25 in BP, we can keep the overall peak from rising more but I'd like to thwart this sudden rise if possible and know why it didn't occur Saturday night.

Leaving Mode 17 in PLL control with phase settings tweaked (damped it faster this past lock) and Mode 25 in BP.