get rid of the coilovers you have now. first, you don't know how old they are and after repeated loosening, that one coilover is probably fucked. with coilovers, you don't need to tighten them, the weight of the car keeps them tight. just get a new set of springs so you don't have to deal with the hassle of coilovers and a nice set of koni or tokico struts.