Bill what are these caster shims..
I will do some research, but curious as to who make it..
I have been bitten by the Camber/Caster Plate idea.. for some time know.. specially since both these setting will come into play as I start to dial the car in.. aways for now, but still want to have a solution..
I would second the whole start with a neutral setting..
Both front and rear toe to about zero.. maybe a little camber in the front, and rear.. see how you like it..
Remember to much camber and you will be flipping tires on each rim to get even wear..
Not having raced or driven a rear car around.. I can't comment on the handling characteristics.. but from what I have heard, with a little power, power on over steer is quite easy.. so you want to be careful how much oversteer you want via that rear swaybar.. On my AWD scooby, I actually have an adjustable, and ended up dropping it to the weakest setting which is tighter than stock.. That was done because I was able to modulate the weight quite easy on that chasis via braking and gas.. and while it was fun at street speeds, since you can get the rear to pop out, I felt that it would be to difficult from getting myself in trouble on the track.. That being said, I was right.. started from neutral or understeer and work your way to where you like it.. may cost more but definitely safer..
My 1 cent
Alex