If you are right and its beating you up in the bumps because it is still too stiff then you could try this:
Where your rear scissors bolts to the sliderails drill a 3/8" hole 3/4" center to center IN FRONT of the current hole. Then move the lower mounting point of the scissors forward into that set of holes. Measure carefully as you do not want your scissors in crooked. This will soften your suspension as the scissors has much more leverage on the spring. In fact, depending on your springs you may have to set the preload up alot higher. While this is not nesessarily the perfect solution it is free and does not take that long. Also, if you dont like it just put it back. Especially if you already have as soft of springs as they make for the cougar. Good luck!