Hey Tony,
That +6 caster is going to give you a workout. I know Jim and John George are possibly looking at power steering.
The -1.8 camber is a good starting point. I'm running -1.0F and -1.5R with a camber gain of 1* per inch of bump. It's working great with our Toyo R888.
I've been running this season without the splash panels and no aero. No issues.
Bob