I have slightly shifted the MC beam pointing to relax the PZT1 PITCH. As a result the TRY value went to 0.97 in a first lock trial.
However another issue arose:
The polarity for controlling the PZT1 PITCH seems to have flipped for some reason.
Since it is still sort of controllable, I am leaving it as it is.
If I remember correctly, sliding the PZT1 pitch value to the positive side brought the beam spot upward in the AS CCD. But now it moves in the opposite way.
Also the ASS feedback looks tending to push the PZT1 pitch to the wrong direction.
I am not 100 % sure if the polarity really flipped, but this is my current conclusion.
PZT1 started railing in the pitch direction and because of this TRY doesn't go more than 0.7. I will leave it as it is for tonight.
Tomorrow I will shift the alignment of the MC to make the PZT1 happier.