A short video of my worst run of the day yesterday - the only one in track mode with all the nannies turned off. I should do it more often, though!
AutoX is fun. Hope you enjoyed doing in your SS. I don't do it too much because typically you are there all day to run 5 times with each run being around a minute. Not enough seat time to spend the whole day and have to chase cones around a hot parking lot when its not your group's turn.
So, you mentioned track mode and all the nannies turned off. Those are mutually exclusive, as in not possible to be both things. i.e. in track mode you are using all the "nannies", just the intervention thresholds and responses are modified. double push of the TCS/stabilitrak button.
Or, you could turn off both the traction control and stability control systems by holding down the TCS/stabilitrak button. I don't think you can disable all of the "nannies" by using the button though. You likely still have ABS and electronic brake force distribution, maybe some other things. Very different than a real analog car which doesn't try to help you when you lock up single tire.
One more thing. GM recommends changing the diff fluid after the first competitive driving event. Probably not a bad idea.