Chassis TAB
This TAB may have some slightly different options for different cars, but generally its an easy on.
Caster: I have recently started to set this to max. It is supposed to help with road feel and also help to reduce cambers, but I am not sure on this
Weight: On the Aston their is a small lateral weight adjustment and a front/rear weight adjustment. Lateral I think can help if the track is say counter clockwise or is more left turn biased. For the front/rear weight I tender to set as much weight as possible to the front, as I generally want my car to be a bit more oversteery and want more front grip to help turn in, off power balance and corner exit.