Yes you want the front soft and back stiff in a RWD car (FR not MR). There's other formulas for other Drivetrains. Aero packages come with some standard cars and lots of premium cars, not just race mods or packages that are only offered in GT Auto. The settings for downforce are in the Chassis tab in the tuning manu.
Example of Suspension for a typical Road Course (i.e. Grand Valley):
RH -10 / -2
SR 5.0 / 8.5
Ext 4 / 6 - Front is softer and back is stiffer
Comp 2 / 5 - Front is softer and looser because of the weight balance (car dependent)
ARB 5 / 4 - Higher the value, the less understeer, but these effects become apparent in a long race.
Camber 2.5 / 1.8 - higher values give better cornering
Toe -.25 / -.10 - increase in negative gives better turn-ins and turn-outs & increase in positive stiffens tires which is used for better handling and stability. I like my cars twitchy and oversteery so theres no understeer what so ever, but this takes some time getting used to. A looser car is faster overall but a stiffer car is faster on a straight-away. In drag racing since you are only doing 1/4mi stints you dont need a stiff car, you want as much contact with the rear tires so a soft rear is good for dragging. For drifting go with positive toe as it will help with your e-braking and forced sliding. Also for drifting higher LSD settings, same can be said for dragging, and other hi-speed tracks such as Monza, LeMans and Daytona.
