Hold up a second. To figure hp, you need to multiply torque at a given rpm BY THE RPM AT WHICH THE TORQUE OCCURRED. You can't just pick some higher rpm and multiply by that, using the torque obtained at a lower rpm. The torque has almost certainly fallen somewhat between 6000 rpm and 6800. Hell, I can see the torque curve heading downward by 5700 plain as day in your dyno sheet. Your hp could still rise beyond what it was at 6000, as long as torque fell more slowly than rpm rose. But, to just say "well, it made 703 ft/lbs at 6000 so I'll just multiply the 703 ft/lbs by 6800 since that's where I shift", no. It doesn't work that way.
I'm not trying to insult you, it's just that if you did it the way I understood you said you did it, it's not valid.