I can't imagine any coilover thats going to soften up the ride. The point of them is to have higher spring rates and stiffer dampening for track duty.
You may be able to contact koni and Racecomp Engineering and speak with them about your situation. I venture that dampening is going to be more of a problem than the spring rate.
You may be able to contact koni and Racecomp Engineering and speak with them about your situation. I venture that dampening is going to be more of a problem than the spring rate.