I would imagine because PBR has a lot of games and using the paper method you'd only select half of the player base minus the queue length. So probably using only 10-15 games and play each game twice. When you have 40ish games it seems limiting to only use less than half.
Plus I believe at pbr there was a queue of only 1 player, so it would be chaotic with paper wouldn't it?
I'd imagine only having only 1 in the queue would be chaotic, for any number of reasons. I've found that a queue of 5-6 is almost perfect.
The number of machines I'd use would be (n-5)/2 where n is the number of players.
Unless BOTH players are changing machines at the end of their game (which isn't FF), there will only ever be a maximum of n/2 machines used with this format, regardless of system used. Unless you include a break (which is what I do) where you can then reorder players based on games played, and add or drop machines as you see fit.
I'd be curious about your get around.
Can't give the game away too early, or it'll no doubt have another clause added to the rules.