I thought I would give an update with my car having endured almost 6 months with steering and handling issues.I hope this might help someone who might have the same problems too. Lexus did a replacement on my steering rack and the steering felt more sturdier but the ride was still the same, then did the Geo with WIM,ride was slightly better but still wasnt as good as what it was before. After awhile I realised that the ride was getting better, I felt the car was more planted. Dis some research on this on some forums only to find out that having changed all 4 wheels it did take a long while for them to 'bed' in. So I am not sure the theory of brand new tyres 'bedding in a coupld of hundred miles is quite true, I think it all depends on the tyres make and the size and probably the way one drives.