I would tend to agree, an OS 55 with a Jett muffler and APC 10x7 on 15% should be capable of a bronze break out. As long as the engine is running well ( no issues ) if you can’t do 10 laps in 2:30 then you are simply flying too loose of a course. This somewhat corresponds with one of the reasons why I quit racing. In gold class guys would be flying airplanes that were capable of 1:20. This allowed pilots to fly a sloppy course and still be close to breakout. Flying skill was less of a factor. My suggestion was to have the gold guys run race supplied 30% fuel to get pilot skill back into being a bigger part of being competitive. It would have reduced the wear and tear on equipment as well.