GTS Set Up Help?

[Rich F]

Anybody have set up suggestions for my GTS?
I will be running BF Goodrich R-1 285/30-18's all the way around.

Thinking 3-1/2" Front & 4" rear ride heights as the manual suggests. Caster @ -5 deg. and Camber -2.5 to -3 deg.
My biggest concern is with caster the caster setting. I've heard a variety of suggestions from -3 low to -7 which sounds really high.

I will be checking tire temps to adjust tire pressures and camber to dial it in. I understand how to tune the sway bars from my previous race experience. Planning to start with a middle setting for shocks and soft for the sway bars.

Any suggestions would be appreciated.

TIA,
Rich