Hi Franck,
              For the format of this tournament, did you consider instead best of five 7-pointers, or even best of three 9-pointers? Since people are playing multiple matches in the same round, they will already be playing a large number of points against the same opponent so why not make the matches longer? If the format for this tournament is already set maybe for future tournaments you could poll people who have signed up to play a tournament to decide what the best format would be.
              On another topic, I remember signing up last July I think for all future tournaments including this Spring and I do not remember hearing of any of them being played. Were they all cancelled because not enough people had signed up to play?
          -Myshkin