just for future reference,
checked the biting point of the clutch which was actually a bit further from the handle bar than I thought originally ±2mm
and another ±2mm of free play when pulling the lever till the clutch would slip.
So as suggested:
First I loosened the cable (1/2 turn) this increased the "free play" more or less to the same as Buhgaboo shows in the picture posted above. Didn't feel nice for me though so I adjusted it again by tightening 1/4 of a turn. This felt better so i left it there.
went for a ride for about 1-1,5 hours, did some slow parts with traffic, some country roads and a bit of highway. I did not notice any hesitation when trying to accelerate fast like the other time, there was a bit of delay when twisting the throttle suddenly and a lot but that could also be the tdc doing its work and it was neglectable.
The only negative thing that I noticed was shifting to 5th was not so smooth. Its not always the same but about 70% of the time its there. Will wait till the chain and sprockets are changed.
Thanks for your help Buhgaboo