what am i doing wrong?

You should be going much quicker than that.

What's the cam? Why are you shifting at 5400 if the dyno showed max power at 6300? What's the torque & horsepower curve look like?

Does it spin out of the hole? What's your RPM at the finish line? What the MPH?

What does it do at the launch... Does it bog, or do the RPMs climb right up?

With a mild 360 in my Duster, I'm running low 12's. I would think you should be close to that as well.