wingman2-
I think setting tweak for the 'sweetspot' will depend on how many laps you can put in at the 'SP'. personally I don't remember the last time I actually put my car on a tweak station. I just make sure my tires are the same size and that nothing has come loose on the chassis to make it out of balance and just go racing. Maybe I'm not good enough to notice. I'll have to check my lap times. I don't think the times change much if at all.
E