I did i wrong, when i recorded the video, because i did not know that the magnifying glass icon lets PHD select the star (and multistar guiding) at that time
I do let PHD select the stars atm.
And Yes, star lost on first guide pulse.
What is certain is, that the pulses are FAR to large. I have to find out why...
I think like Howard Dutton mentioned, maybe it has womething to do with backlash compensation...