tweeiboon.. that is the nature of twintube struts. if you try monotube lik some of the higher end bilstein and titan.. then it is dampening on demand... always ready to charge..
by the way.. if any of your abs are hard to pump by hand.. u will have bruised butts when u install it..
bmw chassis is built so tight and solid that it doesnt tweak much therefore all the movement is in the abs.. it is quite soft compared to similiar sized car of japanese make..