If you're serious about how it runs on the track, then you should be testing different shift RPM points. Pick a starting point (6500?) and go up & down in 200 RPM increments to see what works better.

Even the "good" engine sim programs I've used have been really hit-or-miss on predicting peak HP and torque RPMs. They were off as much as 300-500 RPM on their predictions compared to actual engine dyno testing (e.g., over-predicted torque peak RPM by 300 and under-predicted HP peak RPM by 500).