IMHO, shocks and springs are going to be your solution here. You can start looking at progressive rate springs and start talking to some of the companies who make springs. I don't have time right now to go digging for names but if you do a Google seacrh you will come up with them ... call them. The one we always think of first is Eibach but there are better ones. As for shocks, you might want to see if someone makes an adjustable shock, like Koni, but both Koni and Bilstein make 'performance' shocks so they tend to be stiffer. See if someone like Monroe makes a shock for your ride. The ideal package for a track car is to 'float' over bumps but hunker down in the corners. That is why I would consider going to the Addco bars, as a set, after you figure out what you want to do with the other two components. The end links will have something to do with how tight your handling will be so don't use too short an end link. Use the OE links or at least the same length to start with. One more thing, tires will also effect your ride. Don't use low profile tires if you want a softer ride and the cheap way out is to lower the pressure BUT you don't want to have a Ford Explorer moment so be careful. <g> JM2C
Peter