I have the 9/6kg and it is much better than the stock 7/4 kg on the AX course - faster and more resposnive through the transitions. Not too stiff even on our loose ashphalt at Qualcomm. On the freeway I cannot notice the difference in ride comfort. It feels the same which is a testimanet to the good valving on the Ohlins.
Here is what I ordered. Note with the rear springs I have no preload. There is 1mm of free play when you jack the car up. But it is not a problem once you lower it to the floor. If you go over a drip in the street at speed you will hear a small clang.
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Ride Height I am 12.75 rear and 12.5 front. 12.75 rear is the lowest I can go (two threads left visible). RB Front Bar set to middle, Eibach Rear Bar disconnected. -3.0 front camber, 1/16 toe out, -2.5 rear camber, 1/16 toe in.
I am surprised you are not oversteering with 0.5 inch rake. You should try 0.25 or 0 rake. More grip in the rear and you can power out of corners sooner.