The problem with having fewer rounds is that the players on the bubble of the cut may have never had the chance to play any of the people who ultimately made the cut, making it unclear whether those that made the cut were clearly better than those which barely missed it, or if they simply got better pairings. Luckily, FFG gives you some leeway on their recommendations, so we added the round to avoid this issue.
Kudos to you guys, then. It's always nice to be more sure than less sure the best are at the top. More games are fun, too.