Install longer springs and to have your vehicle sit up higher. Being higher is the only was to keep from hitting objects. The lower you go, the stiffer the spring rate you also need to install with it to keep the car from bottoming out all the time. One of the things that the aftermarket coilover companies sometimes don't mention. When you lower your car via an adjustable coilover, the travel is reduced and the bumpstop is closer to the top of the strut. Driving over the same bump will compress the spring the same amount, only you are lower to start with. Install stiffer springs. Better yet, go back to stock and be done with it and eliminate the guesswork.