[s-cars] wheel rub mudflap. something loose in suspension?

[Konstantine Bogach]

Hi.
Front wheel on my  S4 '93 (Eibach/Bilstein)  rubs the mud flap when it 
moves in reverse with wheels in turn after sitting still for a while.   
   If I switch to 1st and go through same trajectory it does not rub.  
Go back - rubs.  It seems stopping to rub after driving, but I need to 
check it again to be sure. Visual inspection of control arms bushings 
did not show something obviouse.  Stabilizer's outer bushing are worn.  
Could it cause 1'' of loosness (distance between the tire and mud 
flap)?   Or, maybe it is normal?  Does anyone have same symptoms?

Thanks.
Konstantin.