J. Rob, did you take the engine only to 5900rpm for a reason, cause likely the engine might have peaked at 550+ at 6-something with that CamMotion cam?
I'm not Jesse but I've seen a lot of dyno runs. If you look at the way the torque is dropping I believe the engine has about peaked in horsepower. A guess would be that the engine will be making about 445-450 lb-ft of torque at 6,200 and 525-531 horsepower. It's a solid engine build with good heads and will hold the horsepower awhile longer, but it has peaked out.