I lowered my car with H&R sports and have bilstein sports...love the combo, but I find that when im cruising at 85+ and encounter some rough road, it feels like my car is being bounced around too much- To the point where im nervous, so naturally i slow down.. I want my car to handle like it did off the factory floor (well as close as possible w/ a lowered set-up). What needs replacing here? I dont need to go 85+, but it concerns me because I know my bimmer should eat up the road at high speeds, not be unstable..