Ok, adding that to the mix, I seem to establish steady sync (in Bitwig this time) by:

) indeed activating global tempo in the H9, after which I can leave ‘tempo on’ in each preset activated

) disabling H9 MIDI input clock

) sending the CC pulse, strange enough in 8th note pulses now. This results a in a correct BPM tempo (above H9 ‘tempo on’ button in H9 control)

This is all established through USB connection form PC to H9.

Strange workaround, I keep hoping for a more normal MIDI clock sync one day…

Will see if above method also works in Ableton..

Thanks for the tips!