@csaba , the problem here is that the tournament is a McMahon tournament that groups players of similar ability together in small round-robin groups.
This system confines players of lower ability together in even matches and denies them both the opportunity of playing higher ranked players and the chance of actually winning the event.
For handicap tournaments to be meaningful, they need to be single or double elimination, like the one I organised: https://online-go.com/tournament/64786