Today we did several long runs (~1h each) at ~23kW, 46kW, 66kW with different PID parameters which seems better.

P = 0.1
I  = 0.0015
D = 1.5

which implies a different fast loop gain.
For these new PID parameters, it was impossible to use 33% amplifier ratio => to much power on the PID at the diffuser limit (axis 18).
so, we added a NE02 optical attenuator on the mobile diffuser => we can't use the old recipies anymore.