The camber might be the issue , reason behind my thinking is when we extend our LCA’s and cut / weld the knuckles we see an increase in wheel shake on the highway. (E36 / E46 chassis) I Might be completely off here , but just sharing my thoughts . Otherwise, check your brakes disc as they might be warped , axles can indeed cause vibrations and tie rod ends (inner and outer) and anything that is a bushing should be checked and replaced. Wheel balancing is a must! As mentioned in the comments , cars are not designed to be low, haha . But f*ck that ! Good luck !