the older carbed R6's are very exhaust sensitive, and have some of the worst factory jetting possible.
A full system Akro is great on these bikes, but you need an Ivan's jet to to make it work. It's the only kit that I have seen do anything to help these bikes, it makes a huge difference on these bikes.
You can look at
www.IvansPerformanceProducts.com and see his dyno charts on these bikes.
I think Vcycle nut is dead on about dyno tuning. It was never meant to only set the mixture at WOT, but thats generraly the way the dyno's are being used.
When people go in and wait while their bike is tuned and pay $200 thats pretty much what they are going to get unless the operator really knows what he is doing.
Even then you cannot built a complete custom map in an hour that will be as good as a map built by someone riding the bike in the real world and no time limits.
I am interested in the new competition to the Powercommander that you can get an 02 sensor with and have it map it's self. Sounds great on paper, have to wait till I can try one to know how well they really work.
I believe that the latest DynoJet 250's have a mapping program built into them that will run the bike through all the various rpm ranges and throttle setting to build the custom map. I believe the dyno even turns the bikes throttle so no operator error. I have not had a bike mapped this way myself, but it seems like the best way to go for most people if it's avabile in your area.