I'd go with the shine setup to start with then work from there. No bar up front gave me the opportunitity to set current track record at Road Atlanta. IMHO no bar up front is faster.
I found that it depends upon how new (sticky) your rear tires are going to be... You will need to find what you like for how loose you can run the car... this is a balance between how fresh your rear tires are and how comfortable you are with a loose car. Fresh tires will allow you to run stiffer springs in the rear but when the tires go away then you might end up with a car that is too loose. Mid-Ohio does have a couple off camber light in the rear (elevation changes) turns that might prevent you from going too stiff in rear. Run the rear ride lower then the front.
The spherical bearings are a must especially in rear which ends up with lots of slop without them. If you run new tires all the time setup for that... if you run 1 set of tires for many races then setup for this.
again... just my .02 and mostly from MK2 & MK3 data.