So confusing. All I know is all the way back equals tail happy, all the way forward acts like a 4wd truck in parking lots but can make going uphill at slower speeds effortless.
During autocross, auto mode is never really consistant, pretty much stick to your line and the car just does its thing. For me, that seems to be the fastest setting. However there is only so much testing you can do in 6 laps.
I do enjoy 1 or 2 clicks from full forward for messing around on ice. Auto mode does too good of a job gripping and like i said before inconsistant. Been a while since Ive done any parking lot drifting but lets just say I used to be japanese good on ice.
(RACK can back my claim for what its worth)