Fairman, I think you are right, I think it deserves a 7 instead.
Here's video 1 of 4.
Check out the other cars in my class...needless to say I brought a small knife to this gun fight.
In this video you can see what I was talking about with the diff locking up sometimes and other times not. I was trying to get some wheel spin out of corners until the last lap where I tried to go for a cleaner one. Just lots of testing, no serious consistent laps.