We've reduced the motion on PR3, especially the 'bump' seen in the optical lever pitch around 0.7Hz.

Turns out there is a good coherence between GS13 X and the optical lever in pitch. The GS13 is far away from the noise floor around this frequency, so by lowering the blend frequency in X, we were able to gain a factor of a few without introducing too much gain peaking at lower frequencies.

Also, by switching the GS13s to high gain, we improved a little our performance at low frequency in RZ/Yaw.

This configuration seems good enough for now, but the next step is to design a more fitted blend set for HAM2. I'll add that to my to-do list for next week.