how I would attack this problem:
before you start throwing swaybars and changes at it. go back to the basics...
is any suspension binding, are all the shocks in good shape, is the droop good, is the camber good, nothing broken. has the tweak been checked?.... then start going after it. you need to have a good solid base foundation (setup). a lot of times when I have helped people make their cars better its those simple things make the world of difference. its amazing how good a car rides when all the camber is -1, compared to +2, -3, 0, -5. but I see them changing shock springs, and ride height, when all those changes wont help at all with mad wack camber.