A4 TDI 2001 (B6) standard suspension,4 wheel alignment done,when driving at ...say 80 mph -ish, on a slight bend on the motorway car seems as if the back end is 'snaking' or going that way,if ya no what i mean,not very stable. 1 rear coil spring broke,replaced with a 2nd hand one from the breakers of same model A4 but 2003 reg,then had camber and alignment done,only replaced 1 spring as the other one was already taken off the salvage car,car sits level although after a very close inspection found that the spring that has been replaced sits half inch higher than the other side,but you cant visualy see this,i had to measure it! after fitment had camber and 4 wheel alignment done,and also replaced new anti-rollbar bushes (rear) I was also told by the mechanic the rear tyre (1 of them) is slightly out of shape as the toe in(alignment was out) what could be the reason the car feels unsteady at high speed around small bends?