Hi Dave,
Now is better, but I'm not satisfied yet.
I set Z axis speed and acceleration slower, testing a couple of times.
Also I changed resistor value in input divider circuit from 330 Ohm to 680 Ohm
I plan to reduce THC300 electronics reaction time, first to adding capacitor to input from sensor board, and if not satisfactory, to implement integrator circuit (I think).
mrpeja