I think that Brent (bwaller) uses Brembo F05s on his 550 race bike with thinned rotors. I was concerned that the smaller single pistons might not offer as much stopping power as the other calipers, but if they work for Brent under race abuse, they should be fine.
For now, I will probably just run the bike with the stock, squeaky dual calipers. This bike has been off the road too long, and I want to enjoy the new paint!