If you can get ahold of a set of scales to see where your at on preload, ect. On your car your probably going to want to start at 60lb heavier on the right rear than the left and 100lb heavier on the left front than the right front. This is just to get you in the ball park. I bought a car that was acting close to what your talking about. We found it had about 250lb more on the pass. side rear just way to much preload, and the rear springs were too stiff. We changed the springs and turned the shock settings up. It fixed our problem, but every car is unique. It might help if you went to a 5500 converter from the 4500 you have now. I know your trying not to blow your narrow tires off, but you still have to set the chassis up.