Looking at your base dyno chart, your WHP is about the same as mine. So that leads me to believe that the dyno I went on was out.......also no afr readings on mine. Which doesn't help. Think I need to go to a more accurate dyno before looking into anything else........Mine has a ITG maxogen and cat back. So should be slightly over stock. Also my crossover point is 5500rpm, where yours is 5250rpm.
Like I said, it doesn't feel like its lost power.
Thanks for the graphs Drew..................supercharger would be nice lol