I've been driving on yellows for a full year now . . . Hotchkis FSB, but otherwise stock and on street tires (Kumho XSs)
I've set the rears at half-stiff and have forgot about them since they are easily adjustable.
I've found that the car handled best on full soft front.
I did, as an experiment decouple the FSB (so basically, no bar) and kept the shocks full soft for an event. Car handled great except for feeling like it wanted to roll onto the door handles.
This season, I'm going back to the stock bar and will be running Federal 595Rs 245/35 square setup (on stock rims). Might tune the shocks some after I see how she handles in February.