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I think the distance was chosen incorrectly. Why 10 people? For an online round-robin tournament, where rounds can be played in any order, it's better to have an odd number of participants. This ensures an equal number of blue and red teams.
And most importantly: 9 rounds in a Heroes round-robin is a lot. Unlike chess, draws are very rare in Heroes, and the winners quickly separate from the losers. The latter are no longer interested in finishing the remaining rounds, but these rounds affect the Berger score. Imagine that at the finish, not two leaders, but three players arrive with an equal number of points: Ayauhteotl, Maretti, and Gomunguls. This immediately increases the importance of the remaining matches, for example, Scorpiona vs. LeBron. The optimal format is a round-robin with 7 (8) people; those who fall behind haven't had time to get discouraged, and it's already over.
Using the OFB+FB system, you could try running FB (round-robin) and OFB (Swiss system) simultaneously to the next final. The top 3 in FB remain in FB, and the other 4 (5) are eliminated until the next time in OFB (which is wasted time), and there's your incentive. And to determine the top 4 in the Swiss system with 80 participants, 9 rounds are required, and rebellious is right.
And, of course, the choice of templates and castles turned out to be a mess. The selection of templates and castles in Heroes is like the opening in chess. Imagine if the organizers told chess players before a round: "today you are playing the Alekhine Defense"? :)
In a full-fledged tournament, there should be a variety of templates, and the templates and castles should be chosen by the participants themselves.