Ties and disputes

Publish the order in advance and apply it automatically, stopping at the first step that separates the players. The order used here:

1. Matches played, higher first.
2. Head-to-head between the tied players.
3. Sets won minus sets lost.
4. Games won minus games lost.
5. Most recent played match, earlier first.

Walkovers received do not count toward step 1, because they are not played matches. Publishing this before the season is the single cheapest thing an organizer can do to avoid an argument in week twelve. The full order.

Have one player dispute inside the confirmation window, then have the organizer decide from both submissions, then write the resolution to a log everybody can read. The log is the part people skip and the part that matters: a resolution nobody can see looks like a favor, whatever it was. Rule 18.

That is a band problem, not a rules problem. One player two levels above the rest of the field will win everything, stop being challenged, and get bored. Move them up a band, or split the ladder, or recruit two more players at their level. None of those is a punishment, and all three are better than letting them run out of opponents.