have you tried bouce testing each corner ?
see if a damper has gone ?
push down as best you can on each corner and see it the body just goes down the back up - if it "bounces" up and down a couple of times a damper is shot...
it difficult to do on the 197 due to the stiff suspension - it might be worth taking the bottom damper bolts out and working the dampers by hand to see what there like