All four DOFs of green WFS servo was engaged with the WFS centering on and they didn't run away.

The servo doesn't necessarily maximize the green transmission. Both the stability as well as the operation point of the servo is strongly dependent on the beam position on WFS heads, so some more fiddling around is necessary.

Right now the servo only acts on the PZT mirrors on the ISCTEY, yet the servo is very slow as the YAW WFSA and B look degenerate.