The engine should be able to rev to 7000 standing still, and even though it's not recommended, you can rev past where the "moving idle" is, even when it's cold. If you are rolling at all, you can redline all the way up to 8300.
I would say your problem doesn't sound normal. I would assume your moving redline is at 8300 but you just can't get there?
Track / Autocross setup: Forgestar F14 (21.8lbs & 23lbs)
Front: 275/35/18 Continental slick on 18x10, Rear: 305/35/18 RA-1 on 18x11
Drift Setup: Front: 275 Continental slicks, Rear: 255 Michelin PS2 street tire
Laguna Seca previous record - 1:49:498