I run Tokico HP struts and Eibach Prokit springs and I have always had a slight "shifting" issue. I never feel any actual shifting, but under hard braking or hard acceleration, if I hit a big bump there will always be a loud "click" from somewhere within my front suspension, as if something was shifting and then snapping back into place. I have never been able to track it down, and it doesn't happen very often or effect daily driving, so I have just ignored it.