Ok, I'll do my simple diagram again, ALL these are the Ramp Angle slider in the setup menu for RWD cars.
ACCEL:
TWISTY [----|----] SAFETY
DECEL:
SAFETY [-----|-----] TWISTY
PRELOAD:
TWISTY [----|-----] SAFETY
Where:
ACCEL is when you're powering-on exiting a corner
DECEL is when you're off-throttle turning into a corner.
PRELOAD is generally when you're easy/steady throttle like near apex.
TWISTY means increased ability to turn or rotate the car. SAFETY is an increased RESISTANCE to turning (spinning out!), or what I call "safety"
Personally, I go for SAFETY on DECEL and PRELOAD and bias towards TWISTY on ACCEL but it depends on your style. And also depends on car, tyre, traction control etc. so do your own testing.