To be honest with you its mostly a problem of overpopulation of auto-tourneys. A lot of the time the 500 Aikido will be full of people, but the 1k won't have anybody. There's just too many different auto-tourneys, fewer of them with mods that change every week would help, maybe.

It would be nice if the Auto-tourneys were done as just 4 rooms like the ranked rooms for Grappling, kicking, striking, and mixed.
Just make them all 1k except for the mixed, it can be the new 5k.

Supported for now though.