Just fitted a set of eibach sport line springs 50/30 drop for a astra hatch 2 litre to you coupe turbo using the original dampeners, the backs are fine but the front dampeners when all done up and car back on the ground stick up and push the top part away from the wing mounts. when i diver it there is a slapping/knocking noise when i hit a bump so i know its not right, do i need shorter pistons on the dampeners? has anyone else had this problem?