Travis, I have better sense than to play a table game with a 30% hold!!!
But, to be honest, I haven't worked the pit since 1992 or so when I set up the Caribbean stud pit for the FQ's. I am not familiar with Let it Ride rules.

As a Keno manager for 10 years I can answer this one.
"What happens if one or two other players have small wins but the table maximum has been hit with a Royal. How are the other winners paid?"

In Keno the small winners are paid first and the big winner gets the balance of the aggregate.
This can vary from house to house, even with an aggregate, the house might deside to give someone $100,000 instead of $99,947.50.